It depends Adam, an experienced B1/B2 who is prepared to travel and work all the hours possible can earn well in excess of £80,000 and year. Maybe more. Without the License you will not earn anywhere near that. An unlicensed mechanic working hands on will not get half of that. Genghis will give you a better idea of what a degree will do for you but in my experience a degree will not lead you to working hands-on.
Hope this helps.
