Here's an idea!

I have plenty of mask outfits and other effects on heroes that go unused due to having replaced those outfits and effects with new ones.

Now, there is no way I'm going to spend steel, let alone real money, to buy these same effects and masks for other heroes I play.

The idea is allowing players to transfer mask outfits/effects from one hero to another.

Obviously there needs to be restrictions otherwise players could just buy everything once and swap between heroes constantly. Restrictions could include a steel cost for tranferring, or a daily limit (each effect or outfit can only be transferred once every 24 hours?)

Like I said, I won't bother spending steel for outfits that cost 20000 when I've already spent huge piles of steel on a few select heroes, however I would spend steel to transfer things I already have but no longer use on certain heroes.

Make it cost like 5000 steel to transfer. Boom. A new way to sell steel and a way for long time players to give newer heroes older unused effects and mask outfits.