I agree with gooch and zina...
In the beginning, the show renovated the houses, to make them more safe and functional for the family's needs. It was a great service and heartwarming entertainment. But then because it became popular, it had to keep one-upping itself. The emphasis shifted from Makeover to Extreme.
I too have cringed at the sight of good fixtures and products in the house being trashed. And why don't they make it energy-efficient every time? I only recall once or twice that they installed solar panels or geothermal climate systems. And the first thing I always wonder when they walk into the new house is, how are they gonna keep it clean? Vaulted ceilings, thousands of square feet, I couldn't keep up with it.
I haven't watched in a long time, because it's become about promoting the products they're installing, promoting the celebrities and businesses that participate in each episode, and manipulating the viewers' emotions. It also makes viewers, especially the younger, more impressionable ones, think that having all that neato stuff makes life better.
I don't recall that every family gets the mortgage paid for, I only remember some episodes where collections were taken or the builders pitch in, or so on. I hadn't thought about the tax increase. That goes up enough as it is, I can see that it could lead to a hardship for these families. Maybe one of the other networks should do a follow-up special!!! Like one I saw once with people who had one big lottery jackpots and how empty their lives had become.