Materials were just as expensive as a cheap powder coat.
That's the thing - unless you have free paint, it is cheaper to pay someone to powdercoat it.
I used to know someone who did absolutely flawless bike restorations. All in Hammerite. They were beautiful and you certainly couldn't tell they were brushpainted, but the hours of work and materials costs were definitely not "cheap ass", as @bonzobanana has requested.