I guess I wouldn't rather die either. I would just rather buy an Apple Smartwatch, but I guess that's pragmatism for you.
But you imply a good point: Apple has already set FB's price ceiling. A Series 3 is, what, US$300 now? Another $100 gets you latest-and-greatest. I'm guessing competing on price is going to be tough, so what outstanding feature will the FB watch have to make it competitive? Oh, and don't forget that Apple isn't the only one to worry about. My bet on who is in 2nd place on wearables is probably Garmin, and Garmin will come and nibble on you at the other end. It'll be interesting to watch (thanks, I'll be here all week...).
it's going to cost less and sell all your location data, what you're doing day to day when not online data to advertisers.