On an average 4 hour spearing comp I can manage 40 dives (a lot for me) most suunto's I see of other divers there are an incredible 100 to 120 dives. Crazy.
The selling point I try to make to them, is that 40 comfortable and safe dives can often result in more fish than there 120 frantic ones. This way they will listen!
Sometimes you do have to dive pretty hard in comps though. If you're doing 1:30 dive times with 4:30 intervals, you'll lose out to guys who are able to spend more time on the bottom. In deeper water I often find myself doing shorter surface intervals than my dive times, e.g. 2:00 down 1:30 up.
That's not to say short surface intervals are a good thing from a safety perspective. They're not, and the above ratio is quite an extreme example. But it would be wrong to suggest that safety and performance don't compromise each other in this case.
It's the same with depth. Danger grows with depth, but you won't win many comps going to 10m. You just have to mitigate the risk in other ways (training, buddy diving etc).