Technically, pMachine.com and pMachineHosting.com are two companies in a partnership that separately focus on their strengths.
As far as the forums question, this comes down to the difference between a software/product model and a service-based model. Software is a great thing to support in forums. You have a group of people with a common piece of software and people of all levels of knowledge that help and assist, in many cases from experience rather that just from a tech support side. Hosting is a service, pure and simple. While there is a common goal of all clients to basically run a web site, from a technical standpoint, we feel it’s best to get answers related to hosting issues/questions from people that directly work with, monitor, and maintain the servers. This comes from many years of supporting small to enterprise level customers in development and consulting services where again, as a service the customers are expecting a one-on-one support relationship as they are generally more interested in answers.