Every new Electronic technology is expensive at first, it usually drops like a rock after a few years when they've learned how to make it cheaper.
Look at Personal Computers, CD players, DVD Players, Video Cameras, large screen TV etc...
Early Plasma sets were $10,000 or more, by the end they could be had for $500.
According to this chart from tvhistory.com there were 1.6 million Color TV's in the U.S. in 1964.
That would mean they had to sell an average of 160,000 sets per year since 1954, if they sold 100,000 in 1964 when did they sell the other 1.5 million?
Judging by this chart 1968 was the big year for Color?
