How much Steem Power (SP) does one need to be relevant on steemit?

I have been around for a while on steemit, so far I have gathered 18 steem power. I do a lot of voting everyday but less commenting. I observed that the voting does little or no advantage to me unlike posting. So I am wondering how much Steem Power I need for the voting to make sense?

Hive account@crypt0 Hive account@craig-grant #truecrypto or #craigrant,