Hi, @davidad! Right now, SBI is only accepting Steem, not SBD, for sponsorships. If you send SBD, they'll return it to you with a note requesting Steem instead.
They will take SBD, but usually only when the exchange rate of SBD to Steem is roughly equal, or the SBD is worth more than liquid Steem. Right now though, Steem is worth more than the SBD, so that's their currency of choice.
I hope this helps! :)
Thanks..this really helps...