I'm sure you could get some money out of it but I'm not sure it would be that profitable. Bare in mind that there is plenty of free advice around on this kind of thing and various software packages will do it for you. You can also buy plugins and components to do this.
There is certainly a market for professional graphics. I subcontract out when I need serious graphics as my skills lie with development. I could very easily create a menu as you mentioned. I could also make it look nice but not to the standard of a graphic designer.