Define "Successful"
1. A business that generates enough profit to bring in an income with moderate management and attention, or at worst no "hands on cleaning work" after the first few years, and that sells for enough money for the owner to retire at a young enough age to enjoy retirement, experience some rewarding travel, and live a comfortable life.
2. A business that gives the individual or couple a comfortable income, pays for enjoyable recreation, provides for bringing up children and starting them off with a decent chance to succeed in the world, then can be liquidated at retirement age,while savings and investments, along with social security, allows for a pleasant, if not "dream like" retirement. In shorter words, the cleaner bought a good job, but didn't have a business that had a strong monetary value to sell in the end.