This is the first really disappointing announement I've heard from the SPL team... and I don't really see why this was done.
Quest potions were only sometimes a break-even at $0.75 a piece, and with this change it pretty much guarantees that they are a loss for anyone buying them, at least until the end of the airdrop, in 11 months, (hopefully) drops the DEC price back to the $0.001 it's supposed to be...
The only way I can see this working out is to make the price of quest potions actively pegged to the DEC price as well: as DEC goes up, the cost (in DEC) of quest potions should go down at the same rate.