Perhaps the routers can only handle class C private network addresses... it really isn't a big deal.
Yeah I dunno. It functions with the class A, other than the lack of UPnP and inability to save port forward rules on restart. Same behaviour happened with 192.168.1.1 -- didn't think to try something else in the 192.168.0.* range to see if that would have worked.
And yeah, it's not a big deal. I'm just used to typing 10.20.30.* from work, so re-used that at home. 192.168.0.* is cool with me too though.