Ahh, I see. Well, yeah. The issue that I already brought up probably makes that really hard to happen at this moment.
The credit purchase thing is already a feature that will happen for this service as well.
Right now Premium members get 1 credit each month and we are also allowed to purchase more if we like at a later date when that system is put in place.
I agree though it'd be really cool, but partnerships usually doesn't start happening until the service has matured and other parties has found an interest in the service.