The cost of a paint job is just as varied as the results that you see with something that is called a "Paint Job"! Many Broncos that I see with a "Paint Job", actually de-values the Bronco to me..... In other words, it's worth less with a paint job than without it!
Mark is correct. A correct or show quality paint job is by far the most important and expensive part of the build. The $5000 estimate of materials is on the light side, if you have bought any high performance finishes lately. In the past two of three years, paint materials have doubled or quadrupled!
Most individuals lack the resources (tools, space, and talent) to do their own paint.
I completely agree that a professional doing a professional quality "restoration type" paint job can cost 20k-50k depending on rust/metal repair.
A paint job is to the Bronco like the skin is to the human body......It's the part that everyone sees and it's the largest 'organ' (most expensive) of the body!