If the pitch is right, yes, busy main road etc.
As it's a going concern, I don't know the ins and outs of the one you're looking at, but you ideally want a bread & butter car/hand wash to pay the bills, and use the full valeting money to stick in your pocket.
Good money to be earned, but personally, I'd like to see a drive-in-drive-out carwash as well as a proper valeters.
if you do it right, you'll never be short of work. Approach local car dealers, and offer them a decent deal. Even if they have their own valeter, sometimes shit happens, and they need someone *quick*; speaking from experience.
If you put the effort in, like everything, it's very do-able. Good Luck
(from a sports & performance car trader/valeter/everything else that goes with it!)