Saratogan: I don't know what math you use.
Observation tells me that you have to add up all relevant costs and mind the differences.
If you look at a pure cost comparison of clubs and balls, my primary thought is "Why do they charge us at all?", because the repeated use of such a software snippet bears no extra material costs. Thus, the programmed virtual existance of those items should be for free(?)
IMHO, you cannot draw this comparison. If it were real, the clubs should wear out over the years, like real clubfaces and grips do. But, they don't. And, in comparison to real life golf, other costs are missing here.
Look at my former post again: The ball price ain't a ball price but
1) a license with expiration,
2) sort of a green fee which largely pays the servers and the rest of the company.
I see it that way, and I'm very fond of the fact that the flow of credits for these items is under my control!
I can easily play here for 10 $ per week, while driving to my golf course ONCE costs almost as much - w/o yearly club fees and ball costs etc.