iflyforfun
Pre-takeoff checklist
Bwahahahah, no. 20 years ago you could get an ancient C-150 dry for about that. You won't get 1/2 off, block rate is typically a 10% discount.
Someone once told me that it can't hurt to ask. I don't think it is impossible, just pretty unlikely. Back in 2005, I had a deal very much like this fall into my lap. A relocation by my company required me to sell my share in my 172 partnership. One of the partners happened to have a friend that lived not more than a few miles from where I was moving. He had just been diagnosed with cancer for the second time in the decade. He wasn't ready to sell the plane until he had a better feel for if/when he'd get his medical back, and he knew that would be around a year. I paid him a few hundred a month and something very close to $50/hr dry (I think it was actually $35, but I've forgotten). It was essentially my airplane. I flew it when I wanted, where I wanted and as much as I wanted. I could leave it full or leave it empty. He covered all maintenance and my monthly payment covered his tie-down and insurance.
He saw it as a way to reduce his holding cost on the plane. I saw it as a bargain. I flew the heck out of that plane for about a year until I bought my Velocity. It was a great deal for me and not a bad deal for him, but I came with a recommendation from a close friend. A few years later, I was relocated to China. Before pickling my Velocity, I contacted another friend of mine who was regularly flying his dad's 172. I made him a pretty sweat offer because I didn't want to pickle the plane, I didn't want to sell the plane, he'd flown the plane with me and I trusted him. The deal I offered him isn't too far off of what the OP is looking for.
These things happen on occasion. It is all about timing, trust and motivation (for the owner and the renter). I don't think it is a stupid question and see a lot of unnecessary bashing going on. Tell him its unlikely, okay. Tell him what he's likely to get, okay. Suggest realistic alternatives, okay. Tell his he's an idiot, a dropout/failure, clueless, etc and you've gone a bit far, in my opinion.
Oh yeah, and 10 years ago, I got an IFR equipped and nice if not perfect 172 for $50 or less. And the owner wasn't an idiot, he was an extremely wealthy and successful small businessman who had a need to keep his plane from being mothballed for a year and didn't want to put it on the line.
Stranger things have happened.