PFDs are most common on freshwater go fast low profile bass boats ("surfboards")....and that definitely makes sense due to their high speed (60-100mph+), extremely low gunnels and poor performance and attitide in a chop, wave, wake, etc.

The bass boats do set a good example (mostly) for the rest of us about wearing PFDs.....plus all boaters WEARING PFDs, and driver being hooked into the kill switch seems to be mandatory in bass tournies....at least in formal tournies.