Well, actually I own Vertexhost
So yes, my server is with them you could say
And you're right, I don't offer any dedicated packages at this time. That is still in the works.
If you are going to co-lo, then remember, you need to purchase your own server, which will cost a few thousand up front. Then typically you are responsible for installing the operating system, software, etc.. unless you pay to have them do that.
It is much easier for someone who may not have a lot of time or knowledge in that area to just get a dedicated server with a company, that way they do all of the work getting it ready, then all you need to do is put your websites on it