If the FAA were actually interested in safety, instead of requiring the Commercial checkride once in one's life to carry passengers for "hire" in these "I'd like to use my own aircraft to carry myself and a few people on a business trip" scenarios, they'd require higher currency requirements and documented advanced training on a regular basis.
There's also the issue of insurance. Most private aircraft insurance prohibits "for hire" use. Talk to your insurance company before you go blasting off with co-workers on board for a business trip. "Luckily" or not, the insurance company may require the level of training the FAA probably should, in order to change the insurance to allow "business" flights.
Private, Commercial, whatever... the ticket doesn't indicate whether or not the person flies to any reasonable safety standard.
Some Commercial-rated pilots who took the checkride 20 years ago probably have the personal morals, ethics, and interest level to fly and maintain his/her own higher standards when carrying business/co-worker passengers, but there are also Commercially-rated (and ATP rated) pilots out there who don't fly enough, and don't train properly, or those who don't even have a CFI along other than for the BFR, for years and years after the rating was earned, and barely fly enough to stay current.
Scariest flight ever for me was in a privately owned Cessna Skymaster/337 that was poorly maintained, flown by an ATP with an ego, and on a business trip.
The guy chose to scud-run over Corona Pass into the Denver area in a heavy snowstorm VFR, as just one of his many "brilliant" moves, and I was a brand new Private Pilot riding along with company executives who far out-ranked me, sitting in the other seats. Talking badly about their "pilot friend" who just like all pilots in the eyes of their friends was "a great pilot" was a touchy situation. I was both in shock that an older pilot would even do such stupid pilot tricks, and also didn't know what I could and couldn't say about the execs "friend".
The pilot/owner/idiot of that 337 couldn't get the gear down for a while over Las Vegas on the trip out, when I was in the right seat and could surreptitiously help keep the aircraft level while he farted with the breaker that popped, multiple times... and never had the aircraft looked at while we were there. That was red-flag number one. I should have booked a bus/train/airline ticket home right then.
And on the trip home, the exec wanted the right front seat, so a fully-rated pilot was in the back seat... where I could do nothing. Something I learned never ever to do ever again. I don't care how high someone "out-ranks" me, rated pilots sit in the pilot seats, period. Emergencies happen, and having a rated pilot sitting in the back seat and a non-rated person in the other pilot's seat, is a safety issue when they do.
Continuing the story of the return trip, the gear again didn't come down properly arriving at KBJC just after nightfall (yes, the scud running through Corona Pass was basically at sunset), and the ATP-rated moron eventually gave up after making 40+ degree banks while he wasn't watching the aircraft's attitude while he was screwing with the gear breaker and emergency extension checklist... which he had to dig out of the side pocket. Checklists apparently weren't high on this guy's priority list.
Both on the way out and back, he said, "The gear on this airplane always has this problem". After messing around, for almost an hour, he decided to land without a nose-gear down-and-locked indicator.
He shut down the front engine on short-final, bumped the prop horizontal with the starter, and flared... and the light came on. The gear managed to not collapse on the way to the hangar but the light went on and off the whole way there (no shut-down and call for a tug... nothing)...
We'd spent 45 minutes "circling" over Stanley Lake near BJC trying to get it down prior to that. I put "circling" in quotes, because this guy was so distracted by the gear issue, the banking and "circling" was more of an uncontrolled thing than a controlled thing. I would call out over the intercom "Bank Angle!" when he'd get close to 45 degrees, and he'd startle, look out the window at the dark, get his bearings again, and level the aircraft.
Fire trucks and all... sitting on the runway when we touched down. Only time I've ever had that...
The mountain scud running included radios that weren't working properly, and loss of contact on a regular basis with Denver Center starting somewhere around Grand Junction... a stressed out call from them after numerous calls where we couldn't hear them letting us know a B-1B was passing overhead near KGJT with only a 500' altitude difference, and a whole bunch of other things I recognized as having read in accident reports about dead people, in my two years as a pilot and CAP volunteer, even way back then. Since then, every time I tell the story I realize it was even worse than I thought it was.
I was as close as I hope to ever come to being an accident statistic on that trip, and I let the manager know (who was the other passenger in the back seat with me) that the VP should stop flying with this guy (they were friends), and that I'd definitely never get in an aircraft with him ever again. I didn't say anything to the pilot himself, although I doubt he would have listened anyway. My comments were made in private later to both the manager and VP... "No offense meant, but that guy is going to get someone killed. I'm a pretty new pilot, and I'm sure he's seen a lot in his flying career, but he's also taking too many risks and has gotten complacent. I'd prefer not to read about you guys in the newspaper or get sent out on a search mission for you someday."