I've stopped using most of the boosting services... I'll put in a $1.00 to @randowhale and get an upvote of $1.25. When the post pays out I'll usually get 75% (unless i'm really quick) and half SBD return which is $0.468 (!!!) Not including the SP, It's actually a loss! And Randowhale gets the curation reward!
I like @buildawhale because you have a chance of being highlighted in their daily curation posts for more exposure and a chance each week to win Whaleshares for best post of the week.