One thing about getting someone else to paint your helmet is you dont point out every single flaw that a helmet you did yourself would result in.
I sold my ROTJ painted MSH for $675 shipped.
I put a price on it I figured would be fair for what I had into it and what I felt it was worth, I wasn't going to sell it for less.
All prices give or take, $250 for the helmet, $20 for visor, $30 for painting supplies, $20 for metal stalk, $15 shipping, that puts it at around $340 for my time painting it.
I may have gotten more for it, but it would have taken longer to sell it to find a serious buyer.