Adding up the value of the games across the months shows that Humble Monthly Bundle comes out on top as best value for money, followed by PlayStation Plus, and then Xbox One.
Actually that's not how you should work out best value for money. Because by that token if I charged R5000 for Solitude's Bundle of Awesomeness and then give you R5001 worth of games then my bundle would have been the best value for money which doesn't make sense.

How it should work is that if we take the last month then you can work out that for each Rand that you pay you get:
Humble Bundle R7.3
Playstation R9.2
XBox R17.2

So the XBox Live is actually best value for money. I do subscribe to both XBox Live and Humble Bundle Monthly though.