Ask 37signals: Numbers?
37signals.com
37signals.com
EDIT:
I don't mean to dis-credit them. They have a steady income from those who like to use their web-apps. They are also becoming the "role-model" for small web-dev shops.
The other thing to consider is the limitation of 37signals product might raise the number of users. For example: you can only have 1 project in Basecamp. A solution for this would be to create another account.
Of all of your resources (time, knowledge, attention, focus, energy, passion,...), what would you say is the "split" between application development and infrastructure building/maintenance?
For me: 90% app dev, 10% infrastructure. I didn't realize people spent so much resource on the latter.
I wonder why they took on investment from Jeff Bezos - maybe it really it just to have involvement of Jeff Bezos (which would be entirely sensible) not to do with money.
Good on them I say.
Nice numbers that they have there, much more than I expected.
Given these numbers, I'd estimate that they'd serve 3-15 billion pages per year. With 100 CPUs, that's 1-5 requests per second per CPU. Of course, what matters is peak usage, not average.
TB uploaded/downloaded numbers are really useless, they just thrown them in to look more impressive I suppose.
This means they probably have 20-40K of real active BaseCamp users.