I asked Mainstreet about bundling and negative carryover a while back: http://www.casinoaffiliateprograms.com/bb/negative-carryover-and-bundling.21848.html?
They do bundle, and they do carry over negative balances. 
On the other hand, they have an attractive 40% commission rate, which is great as long as you have positive earnings at every casino from month to month. If you get just one big winner, you’re pretty much screwed. :flush:
I agree that Mainstreet needs to come up with a written set of T&Cs. This shouldn’t be that difficult to do; just keep things simple and affiliate-friendly.
I would also like to see the casinos become unbundled so that a negative balance at one casino doesn’t wipe out positive revenue at the others. I’d be less afraid to maximize their exposure if the casinos weren’t bundled.
Shannon and Jason, what do you think?