edit: On second thought, I realize I misunderstood you. I thought you meant downloaded files with downloads, but now I see you mean the amount of files that you can download.

Original comment: That doesn't sound logical, why would you remove downloads from a user's Dropbox? It isn't costing you storage space because the downloads are saved in the user's Dropbox, and if they don't need the download any more, they should be clever enough to remove it themselves.

I personally wouldn't be happy if a service I paid for started to remove files without my knowledge or consent...