If read the marketsplash website correctly, you're giving the customer the option to pick up the completed job either at Staples or the local printer. The price for pick up is significantly more than getting the job delivered through UPS or USPS.
It's really nice for two reasons.
1. People will willingly pay for time, if they don't have the time.
2. It should leave enough money on the table to comp the local Indigo user at your PSP.
Don't get greedy. Whatever you're giving to Staples, give at least the same to your PSP. They will love you for it, plus it will get the whole thing to scale much, much faster. Maybe even sell some Indigos and get some of those folks in Israel back to work.