Do it for the fun!
What a thrill to spend your spare time actually building your own color TV!
Channel numbers that flash right on the the screen!
An on-screen digital clock!
Home entertainment electronics and digital circuitry that could lead to extra income, full or part-time.
If this weren't an advert in Playboy from the '70s, I might actually feel sorry for the girlfriend pictured above who looks like she has little to do aside from making coffee -- which I gather is a euphemism.