I like the concept. Having other things to spend GP and XP on is a novel idea and adds a little bit more control to players in terms of how they'd like to experience progression through play.
I think it could use a little more detail however. For example, the table for Investment results goes up to 14 with a (+) on this entry, but the way that table functions (1d8 + Community Investment bonus) you can't get above a a 14 with the way its written currently.
But again, really great idea!