I believe the lady who started the Busty Clash group was well aware that this type of fight wasn't going to appeal to everyone. But I think it appeals to more people than many think it would.
Anyone who has been a member of fcf for any good length of time has to know there are many kinds of fighting/wrestling, and many kinds of likes and dislikes.
Personally, while I will watch two super model type girls rip each other's clothes off and roll around on the ground, I much prefer seeing two girl-next-door type women in a body to body, breast to breast, hair pulling fight, whether clothes get torn off or not. Size and weight it not too important to me, as long as the girls are roughly the same size.
There is plenty of room for everyone in this particular "fetish."