What I wont do is spend money to earn points, beyond my normal spending habits. I'd rather spend 10 minutes on a survey that gives me 50 points than spend 50 dollars to get the same reward.
Some people have kids and families. If I fell into that demographic I would probably not do surveys. But right now, I'd rather spend time than money for free travel.
With that said, I would do a manufactured spend for a really great benefit like Southwest's Companion Pass. But I'm not willing to spend $40 for 5,000 miles per month (and a bunch of time) for Vanilla reloads.