I understand the concept of nomads, but what was actually the point of looting the coffers of the Roman Empire when that gold couldn't actually be spent anywhere (unless, it could?) I can understand exotic resources like fabrics being used, but would quality of living really improved over time for the average Hun? Is there something I'm missing or was Attila just the world's greatest troll?
Huns were "moved away" from the territories they lived before. As you marked, they were nomads, but that doesnt mean they couldnt settle around areas and control a territory. Anyways, of course huns got "advantages of sacking".
Firtly, consider that sacking is a consecuence, not a objective. Huns, as other nomad cultures, lived of being warriors (mainly). They asked for "tributes": If you pay us, we wont invade your homeland. That was how nomad cultures survived.
Both tributes and sacking-income were not "money". They got valuable objects, food supplies and coin, too. So, to answer your question, yes. They got their lives improved. To be fair, coin is not a good reward: coin value is still dependent on some factors, resources and relics are itself valuable.
As a random fact, consider that "huns" is not one tribe. Its not one civilization. Its a mix of countless tribes, incredibly heterogenous.
edit: a word