It looks to be the same account, but different category listings. Especially since it shows the same screen name and creation year. Each category the readers list on is like a separate profile with its own ratings, but same account. So that is not a scam, it is just some policy of keen's to keep separate listings and ratings for each category. It used to be that you could click a link to see all of a reader's category profiles in one place. I miss that, because it made it easier to see if they were offering a cheaper price on another category listing (which is probably why they ended that feature). Now, you have to comb through the categories to see if you can find additional profiles. Sometimes they charge less on profiles that have fewer ratings.
Now, there are a couple people that have actual separate accounts, with listings in the same category. Not sure why keen allows that, it looks so SUS. Sir-cheo/ Sircheo is the main one I have seen. I have seen his pictures and profiles listed back to back in same category several times, which means he is logged into two accounts at the same time, and could take calls on both.