The type of profiling/calibrating that I am talking about is the De facto type of calibration that is widely used by film studios, broadcast studios, mastering studios, iow pro type studios.
It has only been in the last year or so offered for home calibration for consumer grade displays.
Yes cost is a big consideration for two reasons. Software and hardware.
Also there is the time is money factor. To do a full profile (4913 points) of a Plasma type of display, you are looking at about 5 hours to complete properly. That is also saying you have a K10-A meter (about the fastest/accurate meter there is on the market). Plus the consumer must have something like the eecolor box to store and process this large type of calibration, so that is a extra cost to the consumer of about $650.
I am not saying that guys like D-Nice, Kevin Miller and others are not doing a very good job of calibrating, because they are doing the best job of calibrating with the tools they have to work with.
When you ask "is it not that big of difference", the answer is it depends on how critical the viewer is. Some folks think there is no need for any calibration, others are happy with using the WOW disc and still others swear by professional (standard) calibrations.
In my case I would never go back to a standard type of calibration.
Yes I guess I am the only one in this thread that talks about it, but if you go to the "Calibration Display" threads you will find there are many sub threads where they talk about the LUT cube profile/calibration.
btw, I have no interest in making any money for doing this type of calibration, I am simply a DIY' er that's been calibrating for about 5 years now and whats to take calibrating to its limits (one more time)..