That's ofcourse possible, but there are many many services that pull this trick, and I would be surprised if dropbox was the only one that did the honorable thi

That's ofcourse possible, but there are many many services that pull this trick, and I would be surprised if dropbox was the only one that did the honorable thing here. And even if that's what they're doing, they should realize it gives a very bad impression and maybe round up/down to a different price. Literally anything else would be better.