tv's vs. monitors-wtf?

I went to the electronics store the other day to look at a TV, and I must reluctantly admit to being confused. I like to believe that I’m fairly tech savvy, but this is truly puzzling, and it’s something that I’m not come across, anywhere. Why are widescreen TV’s (as well as films, for that matter) made with a width-to-height ratio of 16x9, yet “widescreen” computer monitors have a ratio of 16x10? They’re even touted as "16x10 widescreen" displays. The resolution on the pc monitors even matches a 16x10 ratio, so if you watch a 16x9 movie on your computer, there are thin black bars on the top & bottom. Don’t get me wrong, I don’t have much of a problem with black bars, as I have been dealing with them for years in order to watch movies in widescreen on standard TV’s, but this seems a little silly. If the industry is moving towards embracing the idea of widescreen, as it seems to be, then why not embrace one ratio? Is it somehow cheaper to produce the higher resolution, smaller monitors in the 16x10? I don’t see how this is possible, but what do I know. All I know is it makes no sense to me. I saw a 22” widescreen “TV” in an electronics store circular, and it was clearly a PC monitor with an atsc tuner strapped to the back. It was even advertised as a "16x10, 1680x1050"(clearly monitor stats) res. “TV.” Sorry, but that’s not a TV. Any input or ideas would be greatly appreciated.