External v internal

working on a plan for my company that at the moment is still on the drawing board. I’m working on some documents I need to get a grant and I’m adding that if the company takes off I’d switch from external hosting to internal hosting…but can’t think of any good enough reasons why?

I know everyone else does this but again I’ve searched the web and can’t find many reasons why.

Any suggestions?

Only one I can think of is improved security.