I personally think you should stick to the first come first serve.
I think just because someone posts about a pet on every page every day doesn't mean they want a villager more than anyone else. I really want Chrissy, but I wouldn't post about it every hour on here because I find it to be clutter.
/my opinion
I second this opinion. Some people like to chat, some people don't. But doesn't mean a villager's value in their hearts are any less than another.