I think I've seen such a system work well in a few instances, but it needs to both incentivize good tagging and disincentivize mis-tagging. The latter needs to

I think I've seen such a system work well in a few instances, but it needs to both incentivize good tagging and disincentivize mis-tagging. The latter needs to be something that actually hurts users, makes them feel the real pain as a consequence of mis-tagging. I'm not sure how to generalize that from the examples I have in mind, which are all... porn drawings sites. Imagine being into a specific fetish, enjoying yourself clicking through new pics, only to get that one mis-tagged pic that should have been tagged with dirty-old-men but wasn't...