I used to own a 1973 bmw 2002 tii that I bought for 4k I drove the crap out of and sold for 6.5k 3 years later. That same car in the same condition is now commanding at least 10k a pristine modded one sold on ebay for 34k a few months back. It has been 8 years since I sold it. The way I see it it's a good thing that people are starting to appreciate these little cars whether it be an old datsun or bimmer. Porsche 912 could be found for around 7k 10 yrs ago and now they can go up to 30k. I plan on keeping the 510 for awhile and hopefully when I do sell it I'll premium bucks. These cars are only worth what the next guy is willing to pay and I'm hoping the next guy has a fat wallet, lol.