Is it normal that it's unattractive for boobs to be too big?

I saw some photos earlier today with these women who had ginormous tits in them. I mean, these things were quite nearly the size of cantaloupes - I didn't know boobs could get so big! It was actually kind of a turn-off for their boobs to be so large, and I found myself wondering what kind of back pain these ladies must be in. It just looks weird and unattractive to me when a woman's boobs are too big, but everyone kept commenting on how hot their planet-sized milkers got them.