Very good point, someone else recently pointed out to me that the DEC price of potions is terrible, and I did the math and the difference is huge!
We have plenty of other options to get credits without withdrawing DEC (for those of us into other chains, for instance WAX). Save that DEC!
Exactly, using another currency without trading DEC is definitely the most cost-effective way to obtain Credits/add value to your account! Keeping all the DEC you can get is the way to go right now... especially because of the SPS airdrops!