I suppose if an agent were disciplined enough they could take any money they were paid over say $700 a week and put it into a savings account during the first six months to cushion the blow of chargeback hell....but when you have to buy leads it really compounds the problem...no easy answer to the dilemma. Sometimes it seems like.. commission = lead cost & gas
You really have to manage your money much like a portfolio manager at a major bank or investment firm. Keep 50% what you make if you can until you make it through the first year. Grind the leads out as much as you can and do some cold DK's and cold calls to mix in.
Also, use your head and common sense, your wallet will follow.