minyan gal: A critical point that you are not considering is that many of these people looking to get married have no interest in ever supporting themselves. Their end plan is support from government, Shver and their community (in the form of tuition assistance). It make it much easier for a boy to want to sit and learn when that is the plan.
Nice just means something above zero, but still low enough to qualify for government health benefits and tuition discounts. These mothers don’t want their sons marrying doctor/lawyer types, who will be able to support their family.