However, on the flip side of the coin, you could argue since it isn't made anymore and the supply is therefore limited, the price is whatever the market will bear - no matter if you're a business or not.
To say it's OK for a business to use supply & demand, but not an individual isn't really fair either. What this implies is it would be OK for me to start a business and scoop up all the hard-to-find, out-of-production stuff I could get my hands on - afterall, all those folks with integrity won't sell for any more than they paid, and run the prices up.
So, if you bought the theoretical L-88 Vette in '67 for $8000, you'd sell it today for $7999 or less and not the typical asking price of $200,000? If so, man, I gotta find a guy like you with a L-88!!! Not to turn a profit, but because that's the only way I could ever afford one.