I don't think it will make such a good business.
<P>Redhat doesn't sell the boxes. And those that do have a limited role in helping you debug things. Mostly initial hardware driver setup, burning the box in, they don't deal with the Oracle or PostgreSQL, nor helping you make a website. Companies like DELL that dares to sell you websites along with a box are the kind of people who can benefit from OpenACS though. But that's a lot of resources. You are taking care of an entire process. For example, Arsdigita have been running for a long while and only a few month ago added a hardware selling division of sorts with a box call Rocket something.
<P>But go nuts, just make sure you make money :)