It all depends. The great operators of any endeavor want to attend to their operation. You might be better of buying a strip mall, and leas out the spaces, or a quarter car wash, and hire someone to perform maintenance. There are better ways to make money without actually working.
The man I work for is filthy rich, multi millionaire. He owns three properties with automatic car washes on them. He leases two of them out, and operates the one where I work. In 2009 he retired from Ford, where he was in upper management. He did the absentee owner thing from 1996 until 2008. In 2004 he built one of his operations, and in 2008 he bought the third location.
It is possible, but, BUT. Those shops were a mess. Drunk, high, unprofessional employees, really talented manager, who let people get away with too much. After his 40 hour work week, he'd work weekends at his washes, where he'd observe things, and make necessary adjustments. Once he retired from Ford, he was and still visits is daily, where he briefs us, and inspects every nuance to ensure the operation is running to his specifications.
After he leased out the location he bought in 2008, he concentrated on his original was, the one his Father owned before he bought it... Revenue per car increased, our tips increased, and after many construction setbacks, volume is increasing.... The man is incredible. I believe it's a combination of his intelligence, dedication, energy level, and persona that attributes to his success. If he leases me this wash, he will be getting three BIG checks a month, that in total, easily cover my annual income.
You have to work to get established. You have to show your staff how you want things done. It would take so much money to make an attempt to pay a manager to care, that he could be making more than you. This applies to almost any service oriented business. Possible? Absolutely. Worth it? Maybe.