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The profit comes from the price of STEEM going up and SBD being more stable and useful as a currency (which in turn also may increase the price of STEEM).

Coin Marketplace

STEEM 0.28
TRX 0.12
JST 0.033
BTC 69692.63
ETH 3775.19
USDT 1.00
SBD 3.76