From what I see, the real key is to get your children rated with a disability, especially if you are a single parent. If you have multiple children with permanent disabilities then you can get enough assistance to live a pretty good lifestyle.
Most kids have behavioral problems as they grow up--it is called growing up. But, when you add the challenges of poverty, abuse, drugs, alcohol, poor nutrition, etc, there is a population of kids who need additional help. In most cases they don't need to be labeled with a permanent disability, but that is what happens for a lot of reasons, most of which come back to money.
For example, a behavioral health clinic that takes health insurance can and will use their disabled clientele as their revenue base. Now the insurance companies say they only want to pay for therapies with empirical evidence that shows they work, so the clinic will have a percentage of short term clients that they treat for a couple of months in order to prove their effectiveness. But, the long term client, especially a kid with ADHD, OCD, ODD, etc, will provide revenue for decades.
So, not only does the 99 weeks thing give adults incentive to stay home, our medical disability system gives those same adults incentive to have their kids diagnosed and labeled as permanently disabled so they get their assistance check for ever. And, at the same time, we give the professionals incentive to add to their list of permanently disabled to keep the money flowing to their clinics.
We have built ourselves quite a system.