Ward: Believe it or not painting the inside of the cups when looked at from the cost perspective is expensive. Yes, I was a member of a club that operated on a very strict budget and the greens superintendent told us the cost of the paint plus the labor was significant enough to matter.
For some reason the edges on the holes on champion bermuda greens are very susceptible to damage, especially a glancing blow by a flagstick so my club, as well as others in the area, are inserting thin white plastic rims to protect the edges and it not only protects the edges but also gives the look that painting the edges does.