I currently earn about 10 SP each week. My active SP is about 4400 SP. I autovote a handful of people whose content I'm very familiar with. I sometimes change my vote afterwards to give them a much bigger vote if they come up with something particularly good. Otherwise I manually curate. I do self-upvote at about 14-15 minutes but I don't think that's particularly dirty a thing to do. Oh, and I use @ocdb, too which has had the effect of adding maybe 3-4 SP to my weekly curation rewards.

It would be so sweet to be able to earn, say 10 SP per day simply by curating when STEEM is at $15 a few years down the road. That's like earning a living by reading stuff that you like. :) But I'm afraid a stable STEEM price in the double digits will be further in the future than that. It would take a monthly active users numbering in the tens or hundreds of millions with their attention effectively monetized and/or hundreds or thousands games or other type of paid content creating a organic i.e. non-speculative demand for STEEM.