Why can't people just worry about their own town instead of others. lol
I would never consider how bored someone else would be with my town because they see my villagers too much in other towns, lol. Why should I put some random stranger's potential opinion above who I want living in my town?
Yeah, this is what always crosses my mind when I read stuff like this. At the end of the day, it's a person's own town that they're logging into everyday, using as escapism or comfort or a source of fun, or whatever. And it's a person's own villagers that they will be seeing everyday and having to do errands for. So expecting town owners to make decisions about their towns and villagers based on what other people think, instead of what the owner themself thinks, seems pretty absurd. But I guess this is a discussion board after all, we gotta talk about something!
I have Robin, Curlos, Elmer, Frank, Opal, Melba, Charlise, Biskit, and Henry in my town. Not many uber-popular villagers there, and I certainly don't think this makes my dream town more interesting to visit.

In fact, it probably makes it less interesting, since these are just your run-of-the-mill, average neighbors, not ones that I worked hard to obtain or spent millions on. But to me, of course, I've learned to like some of them, and one of them is a sentimental favorite of mine from AC:WW (Melba

). I do hope to get some new, different neighbors eventually. (It's a slow process)
As for "rarity" of certain villagers, I think what's meant by that is you'll rarely see Julian or Marshal offered up for free, so they're harder to obtain.