Wait, what cash? Walter had cash in the wall, but Pinkman's money was seized by the DEA after the Tuco situation. Jesse was bust until they started moving a little product in mid-season 2.
No, I think the point is that Jesse's parents put about 400K into the renovating the house, including fixing all the fu?ked up shit due to Walt and Jesse's misadventures (melted gangster, anyone?). Whether they deserved it or not, they looked to make a pretty good payday off flipping the property for ~875K but Jesse managed to leave them flat even. Better call Saul.