Dedicated as single machines not most profit
9 years ago when was in the hostign business full time you got a dedicated server, put a panel on it and sold hosting accounts and that is how it was done.
This is now 2013, dedicated servers as a single machine is defintely not the way to go these days.
Virtualization and cloud hosting virtualization has changed this business drastically and now a dedicated server can make different sources of income.
You take the dedicated, pit even OpenVZ virtualization on it whihc is free then if want good master panel use SolusVM or there is a free one or two out there.
Now instead of having a quad core+ machine with 32gb ram just to sell shared plans on you can divide the machine into variety of size vps or virtual servers, use one for your hosting, or a few for different panels of hosting then sell the remaining space as a vps and you can make alot more money. The licensing discount alone makes it a cheaper way to do things where cpanel for a dedicated is close to $40 you can license a vps for $15 and still run other applications or servers on the same node.
Auto backups, no restarts or downtime for upgrades and if on a cloud full failover makes virtualization a MUCH better alternative to the old model of hosting where you purcahsed a full dedicated for each application or each panel you wanted to run.
I have a OpenVZ node,a VMWare node and a cloud and with just those 3 things I am able to offer 5x the options as the person getting a machine per application and even selling the VPS and hosting cheap more then likely gonna make more money also.