I don't know whether there's any pattern to the sales, but there have been big ones in the last couple of months, and the sale discount plus PC discount adds up. Some of the PC-price items are very expensive at normal price. Some is old stuff, some new but a little specialised. And some items are, I suspect, stuff which competes with high-quality free-stuff -- I wonder about the DAZ Sassy Hair and Koz's Messy Hair. PC membership is worth a month or two for the Environment props and textures, as well.