Traditionally in business, growth has always been seen as a by-product of success.
If you're a company of one, your mind-set is to build your business around your life, not the other way around.
The fewer staff and less external funding involved, the faster a company can move.
A company of one has one massive asset when it comes to customer service: it can be delivered in a way that doesn't scale.
If you serve your customers well, they in turn become brand evangelists for your company: basically an unpaid sales force that reduces your need to hire more staff.