I never asked myself because it's not my business and it's not right to ask anyway. (if they want you to know, they'll tell you). anyway I'd guess it's one pocket with whatever subsidizing can be generated (i.e. adsense).
the short of it is, sR is great and however funded, it's awesome.
Code:
select top 1 *
from online_gaming
where online_gaming.user EXISTS('CoffeeShark')
order by awesome_factor desc
results
----------------------
name
-------------
strafeRight
(1 rows affected)