So what you're saying is, You're attempting to sell something for a ridiculous price that cost you a grand total of what, 2 Venture Tokens?
Its nothing to do with supply and demand. Its all about greed. No one sets a price because they think its 'reasonable', they set it because they hope some rich guy will dump the cash for it because he can.
In the case of the new 110 stuff, i seriously doubt the cost of those mats to be 10 MILLION GIL. You know, the price of a friggen HOUSE.
Greed is the biggest factor, supply/demand is a barely remembered whisper in the backs of peoples minds.