As said before, this has been going on since WT's introduction. It's nothing new. You can either shell out the gil to buy it off the MB or invest that same amount of Gil in buying the materia needed to overmeld it similarly. Alternatively, that same amount of luck needed to successfully overmeld is the same luck you'd need to get the WT variation in the first place. And that's how it's been up to now, so I don't see why bring it up now.
If anything I'd sooner ask for a mid-tier. Something like the item with a single extra materia slot for a total of 3 instead of 3 extra for a total of five. That would already make a world of a difference but would be much more easily obtained via 2 lines.
Adding another sticker breaks the system outright.