I think I can give some insight as to why people give such small upvotes. I used to do this. At the time I wanted to give upvotes to quality submissions in introduceyourself. I wanted to give as many upvotes as possible so I gave small percentages. I did not realize that the help I was giving was so insignificant, even to a new person.
I've nothing against sincere voting, but when it comes in a flood like this I have to suspect there's automation involved.
Regardless, I think the decision to do so comes from the same faulty logic: They think the best way to have the most impact is to make many infinitesimal upvotes. If you want to use automation then you can pick people who consistently do well and allocate a larger percent to them.
it is, they come at exactly the same time, which also pushes away real curators