After taxes, with 5% interest you could bring (and taxes on the interest too) around $7m a year. There are 30,000 Fieros left, so to corner the market (@$3000 avg a piece) would take $90,000,000. If I spent $5m a year for the next 18 years, I could own all of them, and still have $2m a year to play with.

I didn't take into account that they would start becoming more valuable the more I bought.