I haven't gotten far enough into the game to sell anything and didn't play the closed beta. I'm still trying to figure out the game.
Haven't encountered a storyline so far. In GW, they set the tone of the game right away. So far, it's "defend the garrison," help the farm bimbo water her corn, feed the cows, kill worms. Oh wait, something popped up, go help everyone kill the thingie. When my elementalist casts a spell (or whatever), it looks like he's having a epileptic fit.
I know it's premature to criticize, but I think GW2 will mainly attract the 12 year olds from Runescape and WoW. It's doing nothing for me so far. It feels like a graphically-enhanced version of Forsaken World. Someone was saying in TS that this is the first MMO to allow you to fully customize your toon. No, Aion allowed when they launched in 2009. I hope they get some good feedback from the beta.