Of course there is a problem, keeping certain items off the store keeps the raiding scene healthy.. You keep dodging and ignoring this point over and over by trying to brag about the fact that you've killed Gruul /golfclap. The server can make money from the store without having to resort to turning itself into Toys R Us for adults.
Whether DST is BIS is irrelevant, if you can buy it you stop running Gruuls, if they put it on the store for stupid price then it's just robbery. People vastly overestimate how much of a difference this trinket is actually going to make, but it's still enough to keep the raid active and relevant, put it on the store and that is no more. Our guild has had 1 drop since the server went up (which is actually lucky/good), my retail guild never had it drop... It has a lower chance to drop than other loots on the boss, boss loot is not all equal in drop chance.