ArenaNet won’t force money from you.
Paid-for dungeon content in Guild Wars 2 isn’t a done deal; the feature may not happen. It depends what you lot want, developer ArenaNet has said.
“We haven’t decided on what exactly we are or aren’t going to offer for money post release,” lead designer Eric Flannum commented, in a post written by community manager Regina Beunaobra on the GW2 Guru forum.
“My answer to the dungeons question was meant to say, ‘We’re open to whatever our players seem most interested in.’ If after release you guys would like more story content, more dungeons, more events, more maps or whatever, it’s something that we have to consider because ultimately making you happy is what makes us successful. Whether we release that in DLC (like the bonus mission packs in GW1) or whether we do it through expansions (Like Eye of the North) is yet to be determined.