Color accuracy does seem to be an issue across the board, you're right. It's simply hard for me to justify the expense of deeper-than-menu-options calibration on a cheaper set, where it seems like too huge a chunk of the budget. If I'm going to go all out, I'm going to go all out, even if the extra features of the display have nothing to do with basic color balance. My original 60" SXRD cost $4000+tax, which is the most I've spent on any single A/V item, and I still never got it professionally calibrated or bought tools to do it myself. I suppose part of the problem is that I don't want to invest the extra money in something I'll probably want to replace a few years down the road, anyway. For someone who's buying their system for the next 10 years, it makes perfect sense, though.
