Like I said, it's all relative. If you're unemployed and/or just don't have a stable job then you obviously can't drop a lot of money on luxury items like TVs until your situation improves.
Doesn't mean HDTVs are too expensive, just that they're a luxury item and people who have to worry about making ends meet shouldn't be throwing away money on luxury items.
I don't even think that that is a valid excuse. I bought my 56", 80GB PS3, HD-DVD player, along with some other expensive stuff (like a few thosand dollars engagement ring) when I either had a part time job or was a graduate intern and still in school getting my Masters degree (plus I have $15,000 saved up in the bank.) If you want nice things, all you have to do is be smart with your money.
HD TVs are inexpensive, you just have to save up a little cash so you can afford it.