Roughly $60/year. You can do better but I don't go out of my way to do the extra searches (I don't change my workflow for it), and I sometimes throw the points away on relatively useless things like sweepstakes and Skype subscriptions.

I use Bing because they pay me as well. I don't go for the money, I typically use my point on gift-like things. For example, for the holidays I used them on the photos printed on metal or glass, which is worth more than the $5 gift card I could have gotten instead. I also do a lot of sweepstakes entries; I've never won, but meh it's free anyway.