I've been very curious about this. How many places does the block chain calculate out to currently and is that expandable as prices rise? I see more SP decimal places on some third party interfaces that don't show on the current site. 
I feel that minnows even now should be rewarded in whatever small fraction of SP they earn from rewards, even if it doesn't meet a .01 payout threshold. Seeing progress is important for user retention, and would frame rewards as more of a points system redeemable for currency, fostering a more long term - less immediate mindset.