(edited by Moderator)
Story Dungeons
Well, for one, they are all soloable except for the very last one.
I did encounter difficulties and major repair bills when I tried the level 40 part when I was level 35. However, at the level, or above, it’s more than soloable.
There is a karma gain incentive for people who help you.
I usually help my real life friend, and helping him is incentive enough.
You can barter with players, trading your help for theirs, if you have no friends online nor guild members.
Unfortunately, gw2lfg isn’t an official Anet service, and therefore not an integral part of the game.
I hope Anet are working on the LFG tool from within the game, but for now, I couldn’t find any response by them for that issue, except for closing threads due to that already been suggested.