I've bought some small amounts of steem (I have apx 100SP), but it does look tempting to lease steam through @minnowbooster , but after reading this https://steemit.com/steemit/@therealwolf/is-leasing-steempower-from-minnowbooster-worth-it I'm not so sure. I might play around with leasing a bit, but overall I think I will just keep adding to my own SP.