True, a tough challenge if we buy or continue an existing business is that many people feel they are in control and sometimes it is difficult for us to control, companies that are being sold usually experience complex problems from production to marketing, making a new business is of course better so that all control is in our hands.
The most important reason why someone start a business is to earn profit, if the owner willing to sell his business, it's mean the business is failure or not making a good profit. Why the owner want to sell his business if he can make a lot profit and expand his business? it's not make sense right?
That's why, when someone want to sell something where it's related with making money, you're need to be very very careful.