It doesn't matter who gets the drop. Items can only be produced so fast from an nm. This can cause demand to exceed supply which causes high price to off set the demand. It doesn't matter if the person getting the drop was a gilseller or regular player. I would be almost inclined to think the regular player is better at jacking the price up than the gil sellers.
Your logic for why prices are going up is wrong too. As has been explained 10,000 times on this board, inflation is happening. There is more gil entering the economy than leaving. Second, more people are high lvl now going after the same pool of nm items. More people -> more demand -> higher prices. Since supply output can't increase as I described earlier, it should be pretty obvious. If we followed your logic and people CC the gilsellers instead of going after other get rich items, we would see output of high end items decrease (because they doing less bcnms and less killing other nms). This would result in even worse price increases as supply output decreases further.
You also claim if people don't buy it the price won't drop. I disagree, if people refused to buy mill+ items off AH, you would quickly see a price drop as the fees tore through profits. Problem is people do pay the prices, so the price won't drop. I love your last line, the typical blame it on the rich cop out. :biggrin: