If you want to start your own hosting company, and you have the knowledge to code a panel, code a website, code a billing system. More power to you.
But in any business model for game hosting you need to cover all your: Website costs, Billing panel cost, server hardware rental or purchase cost and very very important your game hosting panel.
If you can code or do any of the above yourself, it will save cost, if you cant any business tends to pay someone
When I started my company, I had a silly website that looked bad cause I didnt have money for one, my invoices was done by hand using Excel... but my control panel was always paid for, no way I have the knowledge to code such a panel.
Hosting game servers, is not a "quick rich scheme" it takes time, planning, dedication and very big choices that might pay off or not.
If your looking to make a quick buck because you own a server and a decent internet line, go open source panels.