There are a hundred different reasons to start a company other than to make profit. Don't be fooled by the lies of market capitalism. Some people want to create a legacy that generates income for themselves and their employees, maybe even their children. Not everyone is looking to sell to the highest bidder. With that said, the bigger the company, especially if they plan to go, or already are, publicly traded, or are owned by private equity firms whose sole focus is profit and value of the entity the more likely the assumption is true.