I'd say Bosch was more playing on an idealisism of a 'promised land' than any kind of financial situation, indeed, the NTF seems to have an almost religious fervour to it, much like the HoL, but the HoL is far more apparent in its motives. Personally, I'd say that it's easier to look at the NTF's motives (bearing in mind that Bosch's motives were not the same as the NTF's) as an attempt to 'Return to Eden' from which they had been expelled than any kind of finance matters.
For example :
"I have ten thousand officers and crew willing to die for Neo-Terra!"
In a way, that makes a kind of sense, a civilisation has had its heart ripped out, at least the Vasudans have a physical object to look at, and mourn, and know for certain that their homeworld is gone, the GTA, however (in the story) had no such closure, and situations like that will always breed groups who idolize the unreachable and un-knowable.