I don't think DISH could collect any money for this as by putting themselves in the middle they would put themselves in the position of having to pay carriage fees. You need to maintain the charade of this is just another way to hook an off air antenna to your TV.
The payback for Dish would be in markets where Aereo is available Dish could get out of having to pay outrageous sums for network locals. If CBS said they wanted $0.75 for their channel in NYC Dish could counter with $0.15 and if they could not reach an agreement and CBS pulled the channel then Dish customers could connect using Aereo if they were willing to pay $8 for locals. Many people might not pay for the locals so the CBS station would lose twice, first the fees they were collecting from Dish and secondly with fewer viewers they would collect less for advertising.