Here's my best guess. Based on what has been posted about the relationship between PPS, Chicago Gaming, and Stern.

The MMr project is really a Chicago Gaming project. PPS is just the licensor and probably helped out by providing some original IP. I'm guessing CG had to purchase some parts for the game from PPS as well. From what I understand (and has been indicated by distributors who sent the money to Rick), PPS is keeping the deposit money ($1000 x 1000 = $1 million... all for allowing CG to make the game). (I have no idea if PPS is holding the money from the beginning or getting reimbursed after the money is collected.)

Without seeing a BOM and assembly labor costs, there's really no way to know what Stern and CG stand to make from manufacturing and financing the production of MMr, but it sure seems like CG is bearing most of the risk.