Yeah cause ya know everyone can afford an IPS screen...
Lets face it TN will be around for a long time. It looks good enough for most scenarios, and continues to get better each generation. The quality comes down to who implemented it the best, firmware, parts, manufacturer, etc.
I initially thought that on IPS prices too, but just noticed this 23" ViewSonic for <$300:
http://www.amazon.com/ViewSonic-VP2365WB-23-Inch-IPS-Monitor/dp/B002R0JJYOSeems to be getting good ratings.
I agree TN is "good enough" for most settings, if IPS panels keep coming down in price then they can start marketing LED backlit IPS panels. If they just call them LED MacGyver has more fuel for rant, lol.