It's not an option, but they're forced to.

Those people create the business from scratch, it's become big and there's a possibility to become huge in the future. But, the time when the business is still middle-big size, the multi billionaires already notice their business, the multi billionaires will offer to buy out their business or they will threat them by creating the same business with new name and offer cheaper price.

So the option is, waiting your business got destroyed overtime or receiving a huge amount of money.

If someone want to become a serial entrepreneur, they will try to make a simple business and going really massive in marketing, they won't sell their business, instead they will sell the franchise. They only care how much people will buy their franchise instead of thinking about the survivability of each franchise.

Which mean, the motive of becoming serial entrepreneur is driven by scam.