Scary part is, it isn’t 50, it’s 400. You can have 8 WoW licences on one Bnet account. That’s 50x8=400, then you can double that for Classic characters as long as you are paying for all 8 subs. Throw in another 400 if Classic Vanilla and Classic TBC have separate character limits.
So that’s at least 400 possibly 800 or 1200 characters to use to sock puppet. But that’s just one Bnet account. Bnet accounts and WoW trials are free, anyone with enough email addresses and free time to get characters to level 10 can have infinite sock puppets.