I think it's a good idea. A one-week minimum period seems balanced to me. The method you proposed is fair and rewards all stackers in a balanced way, whether they spend more or less time. Overall, the rewards are proportional to the time that stackers spend on Stacker News.

I like doing this every March as March madness but maybe only half the rewards should be accumulated and the rest go out daily. 

I agree. I've proposed layering different rewards timeframes: i.e. split the rewards pool between daily, weekly, monthly, and yearly rewards.

kr indicated there was some interest in trying something like that.

Undisciplined

I do think the madness is a cool idea and fun but it does create some perverse incentives and I think because it only pays the top 64 stackers that it is great for current stacker engagement but not so great at enticing new users. 

grayruby

oracle

How high do you think will MSM rewards go?

OneOneSeven

Nice! I'm going to zap the bajeezus out of those as soon as they go up. 

First place here I come.