Loads of potential, especially if it’s a 1st person tycoon type game.
Work hard and get more customers, leading to a long queue outside the shop? Hire an assistant! Choose from Paul the Old Pro Mechanic £20/hr, Ginny the Generally OK Mechanic £13/hr, or Larry the Learner with no Experience £7/hr. Watch the consequences unfold.
Could get extra interesting if bike brands could trial out accessories and product designs, see if people like them enough to buy/sell on the game. If it somehow becomes collaborative, with people visiting other shops, players could get a small revenue stream if they run a good shop that brands want to showcase their stuff in. Eventually, doing virtual mechanics will make more ££ than physical spannering.