Hello, booho.
I actually need detailed context. So I just try to explain the second sentence in several ways.
고작 그런 인간의 배를 불려주지 않은 게 뭐가 문제야?
"What's wrong with not satisfying the appetite of such a vulgar man?"
"What's wrong with not enriching such a vulgar man?
"What's wrong with not lining pockets of such a vulgar man?"
I think the second example would be correct prediction given the first sentence.
The first noun phrase, a vulgar man who is greedy for a small fortune, or money from women.
Lee,