Interesting proposal...
If upvoting tags is to be incentivised... (Which to work I think it needs to be otherwise the article won't appear in the relevent tags) how do we prevent abuse of this? Like sockpuppet accounts upvoting tags from their other accounts...
A couple of different ways:
So is not th necessarily the number of votes but the number of reputation-weighted votes.
There could be restrictions on voting on tags and adding tags below a certain reputation.