Where do these NPK street outlaw guys get all their money

I always wonder where the small NPK guys get money... the ones that are rich like kye i understand.. but there are guys that have like 1 car garages, a 800ft house.. a 100k truck.. a 50k trailer and 50k in a motor that when it blows up they can afford to fix within a week.. that **** i really don't understand

I saw a episode where farm truck bought an engine and went Kansas to pick it up , he paid $100,000 for it , fully built "big" nitrous motor for that piece of junk truck !!