i don't understand, what is the advantage in doing it that"
Well. its complicated. Some people will do it to buy premium tickets, like if you have 3 moviepass cards you could buy two IMAX tickets and split the charges for 2 tickets among 3 cards (or just pay the difference in cash if its 1 imax + 1 moviepass card). Some people may be reselling although that seems kind of ludicrous, is there some weird underground movieticket biz really?
The majority case are being fucked over by clueless movie theaters. For years we are used to "please give me 4 tickets, 2 adults 2 children. Here is my credit card." so most people are going to mistakenly think moviepass is the same, and for box office cashiers its easier to run X tickets in 1 purchase and just split the payment among multiple cards rather than ring each one seperately. I've seen at least a dozen times older people be told this by movie theater cashiers and since its the way they've always bought movies they go along with it. This fucks with moviepass's data though and looks like split charges.
Of course moviepass is a total hacked up, fucked up system where they REALLY never want you to do split purchases (if they could disable it they would, but they are piggybacking off the debit card network) but instead 1 swipe = 1 ticket.
So its really just a side effect of the dumbshit way moviepass decided to run around movie theaters by doing this debit card app/load scheme, and then movie theaters not really giving a shit and their existing business practices colliding hard with moviepass.
For example some smaller theaters shut down the box office I guess during the weekdays and you purchase movie tickets at the concession stand, since only 1 college kid is working the entire theater. Well, in the debit network that comes across as a concession stand purchase. Couple people have been banned because from MoviePass's limited data, it looks like they are buying snacks when its just an artifact of how theaters don't all work the same way.