i like to keep them around! i always heard a rumor that if you blow on the puffball ones, more will spawn in the area where you blew it i think i've gotten it to work a few times, but i haven't tried in a while
i don't mind them, but they don't really fit anywhere in my town (they do disappear after a few days, after all). if i happen to be carrying a shovel when i see one i'll dig it out but i don't go out of my way to do it, you know?