This is written from a potential buyer and bidder's point of view - by someone who'll be looking for a new tool to acquire as an end consumer. This could also apply to other product categories of similar item types and many of the online sales or auction site's listings, but I'll lay all of this out with eBay in mind for either a buy it now or an auction listing.
I'd be your ideal target and the guy you want looking at and then bidding on or buying what you'd have up for sale. I'll be really happy with a great deal if I can get it, but I'd have no problem in paying you a fair price. We don't expect some discounted or wholesale price as a reseller would, and if you can interest us in what you have - and it's something we're actually looking for - we'll consider buying or bidding. I've acquired a fair amount of gear via eBay, and not all of it good - so - I think I can pass on some reasonably good ideas from my experiences.