Nowadays, when you convert SBD to STEEM or SP, blocktrades takes into account the value of SBD from exchanges. That is why people got pissed before, because when they sent their SBD to SP, the conversion was assuming that SBD is valued at $1 USD but on exchanges it was worth $5-$13 USD. So if they had $10 SBD, they were only getting $10 USD worth of SP, as opposed to getting $50-$130 worth of Steem/SP.