Even if you don't need to supply your own tools (and every large contractor I've worked with supplies all power tools to their crews), many pro's prefer to use their own instead. Selecting tools is a personal process. Different people like different things, and there's little more annoying than being stuck with tools you don't like 8-10 hours a day. That's like when my former company tried to issue Palm Treo's to all the superintendents. Many were inexplicably destroyed in jobsite accidents.