From time to time other people refer to one of my pages to describe something that they're selling. I don't mind this, but:
Sellers should make it clear when they send someone to look at my pages, that I'm not the one selling the item, and that my gear isn't on sale (unless I advertise that it is). You might want to include a link to this page, as well. Alternatively, copy the information from my pages to your advert, bearing in mind the following:
Some of my gear has been modified, or has some of the optional extra accessories. The actual equipment being sold might not.
The condition of the gear being sold may not be the same as mine.
I probably cannot make a suggestion as to the monetary value. I don't keep tabs on the secondhand market, and many secondhand things are often overpriced.