Rice vinegar isn't always abundant at stores in some areas. You can almost always find white and apple cider vinegars, but not rice. Again, depends on where you're at. Also, I think it's like anything else - we tend to use what our parents used, unless we are the kind to experiment and break out of the mold, so to speak. My mom still doesn't get why I use a toothpaste other than Crest. I can't stand it, but she'd never get anything else when I was growing up. I've never gotten Crest toothpaste as an adult, yet no matter how many times she visits, she's surprised I don't use Crest - after all, that's what her parents used. Meh.