If I'm intentionally going to the Apple store, it's to buy. If I just happen to be in the neighborhood (which doesn't happen much as my wife knows the locations of the Apple Stores and intentionally schedules our errands to be in the other parts of town), then it could be to either browse or buy, depending on my mood and whether I had been thinking about an Apple product.
I have 2 Apple stores about 25 min away each. If I'm going to them, it's usually to buy, but if I'm in one of the malls where they're located I have to stop in just to browse. It's a requirement. In some cases I'll buy something while I'm there.