There's always a risk with forums on shared accounts will peak past quotas. Just the nature of the beast. It can also be one bad script/mod/code tweak that could generate 100% CPU usage, or 10+% of the entire server memory (so true with CGI).
If a webhost has a good firewall and all, DDoS attacks would be nominal (especially if they monitor for unusual traffic, like The Planet does). You, and the the entire server, will know if your site is hit, too!
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