Well I've been in it for a month or so.
I'm not sure if the parameters have changed
But I paid 1SBD for myself and another to have a share each.
Each vote I get is worth around 0.01.
So it'll take a while to break even. Maybe 100 votes or so. Or 50 if I only consider my share.
In my case though, I made a post to find that second person that I would include, and from memory I made around half of that 1sbd back, so I probably need around 40-50 posts before i reach break even point, which hopefully won't take too much longer.