Other cost of revenues, which is comprised primarily of data center operational expenses, as well as credit card processing charges, increased to $307 million, or 10% of revenues, in the fourth quarter of 2006, compared to $223 million, or 8% of revenues, in the third quarter.
A common rule of thumb I tell people is to target their performance goals in application design and coding so that their infrastructure (not including people) is ≤10% of an application’s revenue.
Meaning if you’re making $1.2 million dollars a year off of an online application, then you should be in area of spending $120,000/year or $10,000/month on servers, storage and bandwidth.
And from the other way around, if you’re spending $10,000 a month on these same things, then you know where to push your revenue to.
This is of course a general rule of thumb, and really applies to applications (not say more fundamental hosting or infrastructure products), and applications that consume more bandwidth and storage then usual can push this up.
But it’s nice to see that Google is around there.