If there's an option to skip the ad, I always do. I never watch an ad until I'm forced by YouTube lol. In a few of the channels, they show ads related to some new song or instrumental, I find myself watching them for a while but I eventually end up skipping them as well.
In some ads, YouTube will provide an option to skip the ads but in some they don't provide any skip. They intentionally do this in some of their ads. Maybe there are ads with higher priority.