Don't forget that the prices at Ebay are usually prices that are based on fantasy value. For example, a working Classic 4/40 started at 1 Euro goes for about 60 Euros. sometimes up to 120 Euros when it looks Retr0brighted. Then there are the Classics that are offered without auction for 250 to 350 Euros. But i highly doubt those get sold at all. I'm not sure what it cost to put something on ebay that doesn't sell, but i guess it's fairly low.

However, if you want to get started, just look at other sources where the prices aren't spoiled by people that sell to a fantasy collectors market. Or look out for classic auctions and try again and again, sometimes you still get lucky with 68k macs that are considered to be less desireable.