Domain name and Web hosting research

The websites I looked at were all part of larger campaigns. Oxfam has several shops that sell donated items and give the profit to their cause, and all of the charities advertise, either on TV or on posters and billboards and through sponsoring causes.
These websites are hosted and registered but it is difficult to find out who hosts them because they all have their own domain names that are not amalgamated with their hosts'. It is possible that the charities have servers and therefore host their own websites, however it is hard to believe as that would mean that a lot of the money they earn would go on administration and server maintenence, and charities earn their money from donations.

Domain name registration requires that the person that owns the website gets their website to a server and pays weekly or monthly in order to keep their site up. Then they can choose to buy a domain from a company that will again charge them a weekly or monthly fee. Alternatively, big companies, especially ones that recieves lots of visitors to their website, may buy their own servers and then can have a free domain that they set.
Applying this to my website, it would be much the same story; given that my website may theoretically recieve quite a lot of hits, it would not be worth buying servers because a charity website would not be as big as, for example, a social networking site, that would get thousands of hits a day, and those are the kind of websites that require their own servers.
However, as most of my income, given that my website is also a charity website, would come from donations and fundraising, I would have to make sure that only a little of that money went to web hosting.