Hate to say it, he's right. The Balldo Bunker sold and will pay off the majority of the Mortgage. Even if he loses that house, he'll gain enough money from both house sales, minus the mortgage, where he could get into another house pretty easily. He wouldn't be "homeless" longer than a couple of months, in which he could crash at his parent's house while the sale goes through.
It's beyond retarded that he would take out a mortgage on an already-paid for house. He probably had the money considering how much he was making, plus how much he spent on his car and his drugs.