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higher sp mean you get higher curation reward for posts that you upvote, also you get a slider to play with once you have 500sp!

Vote for good content and not just posts that are known to do well. Leasing sp is not an investment but more about participating in steemit community

ok but there is no guarantee you can make those 10 sp back in 4 weeks .
and if you follow the money to vote for best profit, it doesn't mean you vote for best content and that means great content creators lose interest in steemit because of this.

I have a select bunch of my following who I know will produce quality content over 90% of the time. These people I use Steemvoter and always try to come back in the evenings or mornings and check in a read what's been written . This way both aurthor ad curator benefit the most and leave the door for convo open :)