Since VentureBeat doesn't seem to want to display my comment on Nebo Djurdjevic's (good) post about the Square-Starbucks deal

Are there regulatory or contractual issues with combining small payments across multiple merchants?

[Nebo says] they're going to combine payments because people make purchases at Starbucks frequently. That means the next step is combining a week's worth of Starbucks purchases with purchases from another LVP merchant, then a third, and so on.

If that's allowed, how can [someone] say it's "creating economic benefits that can be distributed among all parties: Square, merchants, networks and banks". As Square comes up from the bottom with small payments, right now they're best for payments (let's say) under $3. Then in another year, they'll be good for payments under $4, then $5, etc. Innovator's Dilemma stuff, right?