It's only 1.5% interest on Steem Power per year if you're not doing anything on the network. But with voting / curation activities, I think you can go from 0.01 - 1% a week interest on voting / curation rewards. For example, by voting and curating, I'm currently netting about 250 Steem Power / week with a 120k SP account. So that's about 0.2% per week it seems. But the numbers will change I guess, but the heart of curation is to be able to earn by doing it.
You should check this out: https://steemit.com/curation/@liberosist/mind-your-votes-ii-a-guide-to-maximizing-your-curation-rewards
Thanks for the link from @liberosist - this should be stickied somewhere ;)
2% per week compounding is pretty damn good so long as the currency underneath doesn't shift. Its active investing because you actually have to curate - but the return is better than lending.. Something to ponder..
Realistically i think it'll be around 0.2%. Unless if a pro like liberosist, definitely higher. I'm more about just voting whoever i'm interacting with half the time.. so not necessarily "profitable", but in different, indirect ways i guess
Hobby passion and investing all in one.. Its a lot better than watching the candlesticks on the chart ;)