If it's a paysite you are running, chances are that your password will be shared and brute force attack tools will be used to guess an account's user name/password.
Ain't suggesting anything in particular ( biased cus I just started offering my product ) but take a look at some products :
http://www.paysiteowners.com/Links/l...thr&no=26&pg=1
Lots of programs you can use ( and no, mine aint listed there )