Yup. Billionaire - doable without too much ethical compromise (e.g early Google). The thing is that a billion isn't much per "first world" citizen if that is roughly your market. Many-many-billionaire - would need some good example, I can only think of bad ones. The SAP guys maybe? But they aren't exactly the richest. The only bad things I've heard about SAP are "making clunky software" and "charging too much money".