If you are serious about entering the domain real estate business, go for it like a business man.
Don't just buy anything you see cheap to sell for a higher amount. Research the domain, upgrade the registration for at least 5 years, build a stop page and promote it make it get some value.
Buying 10 domains at 0.99 cents in e-bay and you don't sell none of them is a loss. While you can buy 2 for 10.00 upgrade the registration and sell each one lets say 200.00 thats profit.
Like thinkaholic said "A domain name is only worth what a buyer will pay..." because superdupercarshow.com sounds great dosen't mean you will end up selling it for $1,000.00 maybe you will but maybe not.
Mess with the best, Die like the rest!