That's not really a useful stat by itself. Someone who sends more merits generally will send more merits to permabanned users, and you might have sent a lot of merits to a person who deserved it (markiz73 might be an example), and they end up getting permabanned for something they plagiarized a year ago. The merit source did nothing wrong in this case and you shouldn't expect sources to check an individual's entire post history for plagiarism before sending merits. If you look at the percentages, chimk is about triple the percent of total merits sent compared to dbshck, but it's still pretty low and nowhere near the levels of djnocide (35.71%) where it is almost certainly an issue.