Added to the store? No. Not for any 'prestige', but because these things should be obtainable in the game.

A great many things should be account-wide and not limited to a single player. The few account-wide things we do have shouldn't be only from the store or statues.

I very much appreciate the Omega emotes being account-wide, but I would much rather they be behind some sort of content that takes effort to complete. Maybe have New fights (that aren't Ultimates, but similarly can't be unsynced) specifically related to these emotes, giving you an achievement and the emote as an account-wide reward. Or go the easy route of having them be rewards for synced/MINE clears of their relevant extremes/savages, but this feels boring (and 'too easy').