To me, not really a problem.
We meet in a YMCA right now, there are machines in the lobby to get drinks or snacks from, but we also bring snacks and coffee, or juice for the congregation after the service.
To me it is just a building anyways.
The money changers were there to rip off those entering the temple, saying that what they brought as an offering wasn't as good as what they had to sell, and chose to make a profit on those because of that. They also were saying their money was not worth as much, so made a profit in that too. So basically they were taking something meant to come from the heart of those who offered, and took advantage of them in the name of God.
Starbucks? Doesn't come close to that type of thing to me, anyways.