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I charge 2% per calendar month; so my main customer, @silvergoldbotty gets to use 50K of my steem power and pays me 1000 steem each month for the privilege.
I also have two smaller customers, who each pay 200 steem per month for 10K SP.
I like it because it increases my exposure to the steem price.
They get to upvote their communities and causes without a massive initial outlay and I make out like VISA with zero risk of default.

Hmmm! You get 2% leasing fees AND earn lots of curation too, right?!

No, the customer gets the curation rewards.

Oh, gotcha.

Some guys are charging up to 3%, with this SBD pump but I'd rather keep my prices down :)

Your price is good. I may consider leasing some from you in the future if some becomes available. Not sure if I am ready just yet though. Please check back in with me if some becomes available. Thanks!

There are a few other players leasing out, @blocktrades, @msp, @dang007, @berniesanders, but pretty much all the SP available has been leased out.