Knowing very little of the facts, maybe it’s because Moss is younger and will be missing out on more income, since neither of them can get a job anymore. But that’s just my uneducated guess for the difference.
This is what I'm curious about - assuming he doesn't pay, by claiming he's destitute, what other recourse do these people have? Their lives are completely upended, and they absolutely deserve this money.
In a state case they'd hire the sheriff to cease all his property and sell it at auction. Since it's federal, I assume the US Marshalls play the role of the sheriff.