Even attaching a charity financial incentive to what I do is enough to trigger my time-for-money logic and conclude my time would be better spent working, eg, 1 hour of contracting a day instead of 1 hour of redditing a day would do WAY more for charity than my reddit contributions would.

The problem is that once you monetize my time explicitly in any way, it both transforms the class that activity is in (no longer recreational!) and causes me to evaluate how successful that time is at being monetized (worse than mowing my neighbors lawn!)

The reality is that the mere suggestion of reddit doing this has already caused me to start reevaluating my relationship with reddit, because they've made it so obviously commercial.

I think reddit may have seriously blundered in this idea.