We get requests on it too - usually for people starting out, but for the most part we do not get involved with them. Some organizations we do have sponsored links and some forums or designers that cater to our clients too.
Those that we've seen the requests for free hosting usually have ZERO traffic to begin with, so they're not consuming any resources, but at the same time, with zero traffic, why spend your advertising dollars
So as Steve said - "sometimes we agree" - but there has to be a benefit