Do the families on Extreme Makeover: Home Edition have to pay for there new house?

I was reading this blog and I dont understand: http://tv.yahoo.com/blog/harsh-reality-f… I get they have to pay the utilities and property taxe increase do to the value of there home going up and I get that they can take out 2nd mortgages if they choose to since the value of there home has gone up. But do... show more I was reading this blog and I dont understand:

http://tv.yahoo.com/blog/harsh-reality-f...

I get they have to pay the utilities and property taxe increase do to the value of there home going up and I get that they can take out 2nd mortgages if they choose to since the value of there home has gone up.

But do they have to pay for the remolding work done originally or are they just responsible for there original mortgage?
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