That little part of the comment of mine which you are so quick to decry as "the worst " you have read says "The two major contributors to a final sale price, both in game and in real life, are scarcity and desirability" which pray tell conflicts with your own assessment of "prestige and quality"?
Try harder next time before schooling someone. And read some more, you need the practice.
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I'll say it again; I'm not saying that the Sky Golem will sell for 10x it's mat cost. I'm saying the mat cost and time investment will the lesser concerns over scarcity and prestige in their pricing.
For instance; if there is only one engineer in a realm and a hundred gold capped players just chomping at the bit for this mount the final sale value of that mount will be grossly inflated versus a typical realm or one which has more engineers than the market for these mounts can sustain.
I don't care how much the Sky Golem goes for. And if I was intending on selling one I'm not going to use the base Ghost Iron price in it's pricing; I'm going to use the market value of like products and if I'm the first in the AH with one then I'm going to make an estimation based on what I think it's desirability value is and not mat cost + time investment. It's not a gem I'm cutting; no matter how many engineers there are in a given realm you can't treat these mounts as a high volume item.