I don't think that's it either, Butterbeer is cheap (in terms of theme park specialty beverages, at least) and something that people will get whether it's their first or 100th time in the land. Most people will probably buy a Power Up Band once, if ever. The only way they'll regularly sell more bands is if they keep making special ones like USJ did for their first anniversary, then people will throw money hand over fist for them (I did, and I've yet to even set foot in either park)