I think any gameserver provider that has generaly half-life and mods could and would you host a specialists server. There are so many games and mods, if a company would list them all ... could be a long list
The reason why we are not hosting for money is because we are no company

And in fact we don't need the money from a few gameservers, i think real money that counts is only possible with 500, 1000 or more customers. If you think about all the details and services a usual good providers are offering, we could not provide one of them.
You need a stable server, access to up and download data, ... start, stop and restart possibilities. Service, updates and support if something dosent work, or just for general questions.
My personal opinion is that form the point on you take money for something you have to provide all or almost all that i've listed above.