Hello,
In the meantime you would want to tack on a little more bandwidth for those *warez* networks, even though that can be illegal, but some users insist to operate those types of servers willingly, and prepared for the worst. I noticed in the 5 years of supplying IRCD access all the heavy networks with warez, and file servers, I should say illegal operatives. Use about 40% more bandwidth. Also if the server is not compressed or using some sort of compressing, the bandwidth is dramatically increased about 50%.