I recently made a trial account on opusdata to see what I could scrounge up as far as anime data goes. Unfortunately, I wasn’t able to get a ton of data, since the backlog of weekly charts are anything but free. But I did come away with their sales figures for a couple different anime movies, whose sales ranged from over a million to a couple thousand depending on how mainstream the title was:
The One Piece/Fairy Tail movie numbers may or may not be reflective of what the shows regularly put up. I have a couple volumes’ worth of data for each, and plan on estimating what their long-term sales are after I get additional confirmation of the amazon model I’m currently using. It does seem, based on a cursory glance at the current rankings of March/April releases, like US releases have fairly long tails.