What's that?
I called customer service and asked them if I can use the service to pay someone 26,000 dollars. They quoted me the 10,000 daily limit and 50,000 in five days.
Based on this, I don't think their issue is large payments, but rather money going in and out of the account rapidly, and being withdrawn right away. Probably having the same amount go out as in all the time is suspicious as well.