Most larger data centers can install a firewall and other Denial Of Service mitigating service that can be provisioned on demand without service interruption. So paying a monthly fee for this is a waste for most unless you have continuing Denial Of Service issues. For less powerful DOS attacks, software can often handle it... csf, litespeed, failtoban, and so on, with no monthly cost. In addition, most larger data centers also offer, usually for free, Network IDS/IPS Protection.

Smoge