You said:

>I'd love for Google to work out how much money they make from me in a year, and then to offer to go ad-free for 50% more than that.

How do you know that the $50 per user per year isn't exactly calculated that way? I'm actually inclined to guess that the value Google gets out of you by showing ads might be significantly higher than the $33 your calculation would allow them to earn from you.

If I could pay for just me, I'd be tempted.

But with a domain it's all or nothing, and I'm not paying for my brothers, parents, etc.

Well, that is the rate.

Because it's aimed at business, not families. Fastmail have a family service that is much more flexible imho. The problem is trying to get family to actually pay for email.

But sadly, not a rate that individuals can opt in to, when on Apps for Domains. Shame really!