In defense of bandsmen (being one myself) it could be that the band they are in has certain restrictions for when the band kit (kilt, sporran, etc.) may be worn. ("Don't wear it if you're going to be buying alcohol", for example.) Or, the individuals may not want to risk having to replace/repair/have it cleaned before the next gig if something should happen to it. Some items - kilts in particular - are fairly expensive, after all.

Also, these days most competitions don't judge a band on its appearance. "Highland attire" is usually the only requirement. As long as everyone's in a kilt, it's OK. There doesn't have to be a uniform, it's just easier to tell it's a band instead of a gaggle. The musical performance (unison, tone, etc.) is what is being judged.


On topic: I don't know of anyone that has tried and not liked the kilt, but I lead a sheltered life.