Holland Lops need to be 4lbs MAX to be shown. If they are only an ounce above 4lbs they can be disqualified. Most bucks are under 4lbs because the only thing he does is breed, he doesn't get pregnant, so why not show him? What else is he going to do?
Bucks are often the highest quality rabbit in the herd.
I love showing. Cinnamon is currently the only rabbit I can show because Lance and Gracie are too big. Cinnamon is a nice show rabbit, and she makes me very lucky.
I enjoy the bigger Hollands though, as well. I think they make better pets. They are bigger and more huggable and squishable. Lance and Gracie are like big ol' teddy bears, whereas Cinny is a bit more skittish. She can be just as cuddly as them at times, but she does have her moments.
Breeders sometimes call big boys and girls "BUB" and "BUD". That means "Big Ugly Buck" and "Big Ugly Doe". BUBs and BUDs can produce amazing babies if they have nice type. Gracie would be considered a BUD, even though she could never be ugly. And she produced my most beautiful little show doe. My best doe was a from a bigger brood doe.
Big does are useful because they usually breed easy, are usually amazing mothers, and have larger litters. I love my Gracie for just that reason.