they're not but they're fun. I can't believe how many times i've written that. the thing is that some of us have spent time thinking them up, and we're gonna have a ranking system cos boards usually do and there's a convenient space under our names for it, which currently is under-used IMO, so we may as well have one that people like the most, or at least dislike the least.
To be honest i'm pretty tired with some people's attitude that they're somehow "above" voting on this, and better than "needing a label". It's just fun, no-one's gonna judge u based on whether you're a herring or a grouper, and it's a group activity we can all participate in a little.
No-one is "above" fun, anyone who loses their ability to see a bit of harmless fun in their day has sunk down into their own cesspit of self-importance.