Well, it really depends )
However the stated 15% would be only theorethicaly possible.
One thing is, while you probably could get "good" price if you want to buy 100 SBD, you can't expect your order to be filled at the same price if you want to buy 10000 SBD.
So the game is usually getting 3-5% on many convertions of about 100 SBD each rather then waiting for your luck of getting 15% on 10000 SBD. That sort of "jackpot" wouldn't happen really often.
Well, it really depends )
However the stated 15% would be only theorethicaly possible.
One thing is, while you probably could get "good" price if you want to buy 100 SBD, you can't expect your order to be filled at the same price if you want to buy 10000 SBD.
So the game is usually getting 3-5% on many convertions of about 100 SBD each rather then waiting for your luck of getting 15% on 10000 SBD. That sort of "jackpot" wouldn't happen really often.