The way I heard it(someone please correct me if I'm wrong here) was that the HWC and IWWC are two completely separate entities by design. The coaches(Brands, Chun) decided on this path during the initial phases of adding the women's collegiate team.
As far as postgrads joining, I hope so. I know Kayla Miracle(and maybe others) spent time training with IWWC recently.
No idea on the IWWC funding level, however. The fact that it's a brand new club and they have a college team filled with stars that they probably want to keep around after graduation may be all they can afford right now. Or, maybe they have the $$ to make big moves after this Olympic cycle....