so looking at a random steemer's wallet, they transferred 5 SBD to buildawhale and 5 SBD to upmyvote then 7 days later collected 21 SBD and 5 SP. I don't really know how connected those are, but I think that must be what is going on, by moving it around it produces more value because voting power or something.
If I figure it out I'll let you know. I wanna see you do well here. :)