Too little staff here and not a feature of the forum software as it is implemented today. And of course the obvious we aren't really geared to be Craiglist everything is Caveat Emperor.
The general rule is if it's under a month old; asking can't hurt if it's had no update in 30 days it's likely gone because most people that sell here will come back and "bump" the ad to the top of the list at least once a week and we don't stop them from doing that. It's also good to click on the sellers name and see how often they post. If the seller has < 10 posts and hasn't been online here for 6 months; there is probably no reason to contact them.
In general:
Vendetta's last about 1-2 weeks at most if priced correctly
Silvios 1 month 3 months at most usually.
Q's and Softriders tend to last 1-3 weeks because they have a lower price point.
Wheels and accessories are completely random and easier to sell on BROL.
When selling if you want you bike to sell; assume it's going to loose 10% value per year. That's how I price mine and they always sell. Rotated 5 out in the last 12 months using that formula. Time to build some more
In the end the for sale area is here to help the community; upgrade and expand organically. We'd rather people buy new bikes, but it is of course nice when the established riders can upgrade and pass down the old stuff to help lower the barrier to entry for the new or the uncertain riders; so the forum is here, but that's about as much effort as gets put into; the rest is self policing; and for the most part it works for what it is.