Lifetime point are good only for credibility. Weekly points are what matters for prizes. 5-$50 gift cards a week are up for grabs. And every time you win your weekly points reset to zero. I currently have 790 lifetime points, but only 199 are eligible for this weeks drawing. They accumulate forever as lifetime points only for credibility purposes, hopefully gaining peoples trust and in return awarding you points.

I don't believe you can. It would be awesome if they could be used to put everyone in a final drawing when all is done to try to win a grand prize