It isn't about intent - it is about interest.
> And if you do click an ad, you're less likely to become a conversion because your intent is still to get back to Facebook as soon as possible and see the rest of Dave's party photos or whatever.
Not necessarily. I'm working with a customer right now where I have a 24% conversion rate on movie tickets. They routinely shell out $7-$21 a pop with this conversion rate; the catch is, I have to be very careful about who I target.
This kind of trend goes across the entire industry of FB ads - target well, optimize and approach based on interest and the money will follow.