I see people say things like this a lot on HN ("I would easily pay X for Y, if it meant no advertising"), and I worry that we are a bit of a self selecting population with the means for such things.

Imagine you have family with 4 kids. Are you actually going to spend $600/year on facebook?

Also, I wonder if the people who _wouldn't_ pay for a subscription are just quieter? And finally, would you really want to be on facebook if it lost half of its user base because that half didn't want to pay?