Facebook gonna pay their users for their data to advertise products and services? it's very unlikely IMO. A service that you use for free and you enjoy using it with many features, no doubt that you're the product and they aren't going to pay you.
I think that's quite possible though. They might pay you but your data will be collected, which is much more valuable than the money they spend to make people accept the terms & conditions.
Facebook is too strong, while most people are too lazy or to ignorance to protect their own data. So here we have a big data machine with a small cost.
It might be possible but that's the return, it's like they're going to pay our data. They aren't going to pay because they will advertise products to us but they will pay because they already bought our data.
And for those people that aren't aware of protecting their data, well it's much better if they'll get the incentive rather than receive nothing while FB or any establishment is taking advantage of them.