I think Frantik hit the nail on the head. It's about adding value and most importantly reselling at market value. The annoying flippers are the ones who post the same bikes over and over at prices which the market rejects. I think the trick to making money is to be really knowledgeable about the going rates for bikes. If a bike doesn't sell in a week, chances are good that it won't sell at the asking price. Once you have a feel for what your market will bear, you can better select bikes that have profit potential.

BTW: [MENTION=220566]frantik[/MENTION], nice score on that DB Ti frame. I picked up a Ti bike last year for peanuts, the seller buried it in a multiple bike ad. He described the frame as "made of bronze". The components were shot, rebuilt it with nos parts from my bins + a few new bits. Enjoy the Ti "magic carpet" ride!