Quoted from DCfoodfreak:For now prices have topped out a bit. 6 months ago every sale created a new higher price and the titles moved. Lately not so much. May move again but clearly we have hit a price barrier.
The guys out there that have been collecting the last ten years or more will tell you that every summer game sales slow, everyone is on vacation,so that's where the money is going.
It used to be oct,nov,dec was the best time, but over the past three or four years it seems to be feb,march,April because of tax returns. So the only sales/price barrier is seasonal