Its buying votes. you bought me steem up votes derived from the daily reward pool by buying me SBI tokens. Not saying its right or wrong - just what it is.
My view is if you buy SBI tokens, you should get votes in SBI tokens which later you could trade for steem on the market if you wished.
thanks for the SBI, but i had them cancel voting on my stuff awhile back, got sick of my one word comments being pushed to the top and nobody to downvote them to where they belonged lol
All comment voting by SBI has since been stopped.
I don't really care that much. My comments don't get voted if I make more posts. The comment voting is I think just so that the weekly quota can be used. If someone only writes comments, that's where the votes will eventually be.
Tokens are pretty much useless though.