Hobbit2 - Chapter 02 - Roast Mutton

[Galadriel55]

First of all, even if Thorin had considerable wealth for exile standarts, it was still meager in comparison to the former wealth of the Dwarves:

"Call them [halls] so, if you will," said Thorin. "They are only poor lodgings in exile." (Appendix A, III, Durin's Folk)

Originally Posted by jallanite

No reason is given as to why Thrór, Thráin, and Thorin did not join their folk with the folk of their kinsfolk in the Grey Mountains.

Firstly, because the Dwarves abandoned the Grey Mountains after Dain's (the first one) death, due to the constant threat of dragons. Secondly, for sentimental reasons. No mountain can be as good as home, and no success can really replace revenge in a Dwarve's heart.