If a twin rental is $300 an hour and someone wants 500 hours of multi-PIC, that's $150,000. OR someone could just buy a $20-30K twin with a fresh pencil whipped annual, put no insurance on it. Run the Hobbs and Tach ~500 hours on the ground, put some owner oil changes in the log book. Fly around a few hours during the year moving it from one local very sleepy, airport to another. Sell it at the end of the year for scrap, maybe have an out of pocket cost of $5K.
How could that ever be proven? Would anyone care to even try to prove it? Once the airplane is scraped how are you going to prove it?
I believe this happens everyday. The financial cost for someone trying to get into a professional pilot job is just staggering. The temptation to do the above is beyond great.
This to me is about as unscrupulous as having 3 pilots in one aircraft logging PIC time, regardless of the legalities. The assumption when someone claims to have 500 Multi-PIC in my mind is that they have been actually going somewhere in a twin, controlling the aircraft by themselves, and most importantly making all of the decisions relative to flight by themselves. The rest is just semantics and regulation manipulation to me.