OH GOD, the quitting incident was awful-- and indicative of how out of her depth Lynn let herself get as a storyteller-- and it still didn't make any sense that they couldn't move. Mike was still bringing in grocery money with freelancing, whatever Lynn imagined that meant, and pharmacists make a lot of money and are in pretty high demand. It's possible that Lynn thought Dee was a pharmacy technician (and therefor making ~$10-15/hr). This would explain their willingness to live in a friendly firetrap, while making Mike an even bigger dick, but that's not what it says.