Also, one of the weirdest things about this hobby is that it allows a mindset among consumers to think that additional small pieces of plastic or fabric are rational reasons for one item to cost 10% more than another at retail.
That gun, robes, and armor pieces are absolutely NOT equal to $20 more in costs for each figure over Superman.
The only tangible reason I can think of is a huge difference in expected run sizes for each item.
Out of curiosity, do you have any idea how difficult it is to tailor at 1/6 scale? B/c I do. I've done it and I'd charge more than $20 for that robe, not including the armor on top. And while the robe maye seem simple to some, it's a quite complex piece if you know about fabrics and tailoring. One could say the rifle with Jor El equals the 1:1 and 1:6 command key with Supes, that still leaves the robe and armor on top, which to me, equals the little bit of extra charge.