You have a good point. However I think your analogy doesnt take into consideration that you can't really grow your house beyond that of whats dictated by the si

You have a good point. However I think your analogy doesnt take into consideration that you can't really grow your house beyond that of whats dictated by the size of your land and planning permission, whereas a company's size is completely elastic. It can start the size of an outhouse and grow to a factory (or, unfortunately, sometimes the other way around!)