The more you stake, the more you make.

Staking is locking the coin up for 4 weeks. Once you have staked a POB token (or 1000), your upvote will now have value. New POB tokens are minted by a staker upvoting a post. You give whomever you upvote half of that inflation and you receive the other half.

So, to get a ROI on staking POB, you either have to curate and upvote (you get 10 full powered upvotes a day but can make many more lower powered votes before you lose all voting power) , you can also delegate your POB to a project that votes and gives you dividends (@amr008.pob is the best example I can think of), or you can follow someone else's curation trail on hive.vote and your POB power follows their vote. The latter 2 options are passive whereas the first option has you involved in the community. Your choice.

As far as APR, last week, @amr008's project paid 153%, which would be pretty close to what you would get if you manually curated.

I hope that helps.