This is not related to curation, but please don't use the conversion function, as you'll lose money. This is because the Steem Dollar is currently overvalued at $1.80 or so. So, yes, you'll get a much better deal in the Internal Market. Or you could sell SBD at Poloniex or Bittrex and buy Steem from there if you want more liquidity. Instead of ~$1.50 which is what Steem is worth, you can buy Steem for SBD 0.80.