I agree with Holz on this (which is a bad thing you have me agreeing with holz), services should not be setting these types of bans. An op every once in a while yes but not services. Many of these bans knock out hundreds of people at once. Some even over a thousand. For example:

1052/15836 users matching "*!*@*comcast.net

We have over 1000 people on comcast at the time i ran this check. That is not really something you want being banned because one user was an idiot.