Account value is decent, but nothing to spectacular (have seen 100k+ accs go for 400-500€). You have a nice collection of legis and precursor, also a lot of shared inventory slots and a decent mat storage.
Dunno about the the amount of characters, lot of them are equipped with "just" the necessaries (100-600 gold worth). But your thief is pretty stacked.
You obviously do a lot of PvP and WvWvW, so for people interested in that, it could also be interesting.
I guess it could go for ~250€. In some cases maybe even 300€ if there is something interesting for the buyer on it.
If you are interested in selling, you can send me a PM. (ANet banned of my acc's :D)