Being charged twice for the same iCloud account?

I have a 2 Tb cloud account which I share with my wife. We don't actually use all the space but its good to know it is there and we shouldn't run out of data.

However, although I pay for the iCloud my wife 50 Gb is still being charged, only to my account. In the scheme of things it is not much, £0.79p, but over time it will build up and with Apple being the worlds first Trillion $ company they do not need my £0.79p per month.

OK I know some of you might say "What the heck £0.79p!" but why should I subsidise the worlds first Trillion $ company?

Anyones thoughts would be appreciated.

[Re-Titled by Moderator]