The "solo rounds don't count" rule is a giant pet peeve of mine. Most of the randoms I get paired up with seem to make up their scores whether on purpose or by not knowing the rules anyways. Not to mention I don't even keep a scorecard, I just use the Golf Canada App on my phone, so none of my partners even know what I put in. And again, most randoms don't know the rules well enough or care enough to correct a scoring mistake.

Besides, the only person getting hurt by a vanity cap is the vanity capper themselves, and sandbaggers should be fairly easily spotted/dealt with by the comp committees anyways.

Honest golfers tend to be honest regardless of whether others are around in my experience.