Very few things on the planet annoy me more than the Craigslist "Re:" posters commenting on the price of another bike. If somebody wants to ask too much for their bike, then nobody will buy it. If somebody buys it anyway they are stupid and didn't do their research and good for the seller. Outing lies or potentially dangerous, damaged bikes are less annoying and sometimes have a place. In general though people can take care of themselves and decide how to spend their money on their own without the help of Craigslist "good Samaritans".