Not really sure if you are suggesting that The Pharmacist should also red-tag members who are not sending merits at all or if you think that he should red-tag more members who are abusing the system and sending merits for various reasons?!

theymos himself said that he doesn't have anything against merit sources sending even up to 50 merits at once to the same user/post if they feel the post deserves those merits. And if they cant find enough posts worth meriting. He would rather have 3 members getting 50 merits than seeing those merits not being sent at all by the merit sources.

But it is important to distinguish those posts that deserve X amount of merits and those that are obvious examples of merit abuse where the post has absolutely no quality but received high amounts of merits. I haven't checked who The Pharmacist has tagged for 'merit abuse' but I doubt that he would do it to anyone who isn't involved in dubious actions.