Ben Brown reveals a bit on how their point system worked (and didn't) on Consumating.

Points as currency always seemed too challenging to implement without a the checks and balances it'd require so I never did it on FP. Now I think it's too late. To focus on the points would change the way people interact with each other and the site.

I can't wait to see what else Ben writes in subsequent I Love My Chicken Wire Mommy Posts. It's a pretty interesting subject to me.