Nearly impossible for people to pay using visa or other CC is the problem, they get sent to resellers who in return start asking for gift cards and other scams , this leads to distrust, once you have scammed 1-10 users the words spreads quickly and thats a rip for your reputation as a filehost permanently.
I hope MP can recover from this, i strongly believe not having a payment option at all is better than sending users to scammers. Your reputation cannot be repaired once a user has been scammed. And no i wont report the resellers scamming, its moneyplatforms job to check for these scams, the affiliates job is simply getting you the sales not look for fraud within your own system!