Interesting thought. It does have some merit, the capital is your main source of income at the start.
On my second run, I've definitely seen my income in my capital drop as a result of not supporting the elves much at all - which could have been troublesome at the start of Act 2 if I didn't come into that chapter with a lot of extra cash and research. More than once I've made decisions against the faction I was going for because I really didn't want to lose any more Elven support.
I also like to think of the player's home capital as the home of the Rivellon Times.
I'm not going to jump immediately to full endorsement, though.
