While it may be worth $600, no way you are going to get that at a garage sale, at least around here. $150 to $200 at a garage sale is pushing the very top around here. Garage sales are typically $50 or less. I once paid $200 for a bike at a garage sale, but it came with a host of extras.
Your area may be different than mine, although I go to garage sales just about every week, and I have been to them in many regions of the US.
Garage sales are meant for getting rid of stuff, not getting full (or anything close to full) value out of an item. Its the wrong venue for that. The buyers you want will not be perusing garage sales. Those that do are looking for deals, either a basic recreational bike to ride, or something to resell at a flea market/ebay/or whatever.
Last edited by wrk101; 05-14-12 at 08:13 AM.