I up-vote everything I think people should see (often controversial/unpopular opinions I agree with), and down-vote everything else (giving my up-votes more wei

I up-vote everything I think people should see (often controversial/unpopular opinions I agree with), and down-vote everything else (giving my up-votes more weight). I would like the ability to invest in comments I find particularly important (i.e., spend 100 karma), and reap the benefits if it ends up being useful to those who would otherwise not have seen it.