There are all kinds of excellent new characters, events, lands, and story lines in each of the Guild Wars expansions.
Sell the gathered stuff at the highest price tag you can to guys wanting to power-level their craft.
DISCLAIMER: DMOZing.com is not affiliated in any way, shape, or form with DMOZ, AOL, Netscape, their management, entities or their official websites. Links to external websites on this website does not constitute endorsement.