That why Gale sale them the item to dispel the effect of the curse on people, not the curse on the item itself.
The entire theme of this mc is all about turning bad points to goods points, somehow. Like the stat drain curse gale placed on himself at the start, or how he turned tentacles of demon lord heart into massager, or that creeping choker.
In a sense, it shows that what we thought as bad things (curse) is not actually intrinsically bad, only the effect of them that is bad. So if you can handle their effect somehow, you can live with them.
If you can live with those creeping looks, too.