I wouldn't say that centimeters are a school thing; the unit is very commonly used at least in Finland. For example when talking about a person's length, or anything else where a centimeter accuracy is suitable. Decimeters are probably not used at all beyond school though. Deciliters are very common for volume measurements, though.

Yes, one who is mega-rich might rather pay up for comfort, but I'd think this TV might also be interesting for a home theater aficionado, who makes maybe "only" somewhere between 100k to 200k a year. For this person, the 40k difference might still be rather huge, and he will most probably be prepared to complicate things a little if he can save tens of thousands (even after he's paid for shipping and handling).
Of course, since the price will likely fall a lot in the relatively near future, mr $150k/year might just wait a bit.