I do not have certain statistics for this, however I am fairly certain that bonds are the main drive- as well as treasure keys during events. A couple of cosmetic outfits doesn't bring them the most revenue, and according to your earlier post- there isn't a high demand for this. So I don't see how they would lose money from giving players this option. I don't believe it would hurt the company one bit.
If it does, I will retract this post as I don't want Jagex to lose any income.
Money lost is still money lost.
They have to make another source of income for it and I don't think ppl want more MTX
Well, then don't make this option f2p, make it something you can buy from Solomon's store. That way, the people who don't want cosmetics, can pay for it. Problem solved. - Which also solves Tenebris' consern of this not being worth dev time.
Doesn't seem like you fully grasp the problem here.
Even if it was members only that's still money lost on ppl not seeing the overrides.