things sell on craigslist just fine...

for cheap, they sell in days, if not hours. for a good, no-hit price, they take weeks... maybe months.

i sold a wheelset for 25 bucks in 15 minutes
a frameset w/bb seatpost chain and stem for 50 sold in a day
some cranks/chainrings handlebars and a bottom bracket for 50 sold in a day
tried to sell a complete flip flop conversion bike with brand new wheelset for 350 in socal, i had a bunch of emailed interest but no one actually came through. after 3 weeks of callers not coming by when they said they would i gave up.

you can get a pretty good return but it might take a while. ebay is best if you're in a low-demand area... if you can cheaply ship.