Don't you think commen rewards are for most people just like post rewards?
With that I mean that there are only a few comments that receive those kind of rewards. For 99.9% of the minnows goes that they can comment a full year to earn $100.
And about your experiment, I don't know how many comments you posted that week? But I'm guessing it was really a huge number. So that indeed gives you more lottery tickets. Probably even so many that it ain't a lottery anymore.
Anyways if you put a lot of effort in quality comments, it's really worth to get those upvoted. And I enjoy reading your encouraging posts as they show it is possible to make a nice amount of money in a legitimate way.
And last but not least, I'm already happy if my post or comment gets upvoted with any value. I wonder how long I keep smiling if I ever get such rewards.....?