I think it will be most cost effective if we hire one server and unite all good projects here. It will also give stimulus to other members to work on good projects and host them after they successfully build it in localhost.
The project are owned by the different creators of the project, even if the forum wants to do as you say and integrate those projects into one server, the consent of those who owns it has to be signed/agreed they might choose to remain single and not to be joined in one server with any-other.
Those projects are good/of-assistance, but I would think Incase of any thing - discrepancy/bug/harm or anything else, the forum will not want in on it, it's not forum owned.