Supply and price don't necessarily correlate. If you divide the circulating supply of steem by the circulating supply of SBD, you get a 48.5 to 1 ratio, yet the price of SBD is only about 4.5 to 1 against Steem (currently).

There are other factors at play that dictate the price of SBD, some of them internal that are set by the miners. You can buy up SBD all day and they could turn back on the faucets if they need to increase the supply.

Not disagreeing because I like to be disagreeable, just giving a fair warning that SBD prices are rigged and decreasing supply won't change that.