I don't think that's really the problem.
Sellers have cultivated a buyers market for certain things.
What I mean is that there are crafters who willingly sell stuff way under material cost (even if farming for mats), just to get rid of the synth. To those people it simply doesn't matter that they lose millions on crafting, because they have absolutely nothing else to spend cash on.
It's like other people in this thread said already. If the market can support whatever you raised the price to, then it will stay at that level, otherwise the price will drop again. No one person is able to control the market.
No matter what the price if a crafted item, there will always be someone to complain about that it is too expensive. My solution to this has always been "Bring me the components needed, pay a fee, and I will craft it for you.". Those who like the convinience of the AH will just have to put up with whatever the pricing is at the time.