I agree with what many of you have pointed out.
The thing that gets me is the constant "oh you can save so much money doing the work yourself" of it all. And yes that is a cost saving strategy but only if you already have the tools, equipment, and know how to do the work safely. Replacing electric panels, rewiring a house, and installing modern HVAC systems is not something most of us can safely do.
In fact most of these homes probably need all new plumbing too and possibly septic systems.
Mess up these things and you'll be up to your eyeballs in debt, sewage, and fire damage.