I only know half a dozen software empires. I know a lot more hardware empires. And I am not talking about semiconductors only.
I'm pretty sure my own company does not qualify as an 'empire' by any standard, but it keeps me free, off the streets and pays the bills, I couldn't wish for more. I wouldn't exchange it for a boring job in investment banking for whatever compensation you put on the table, there's more to life than money, as I've found out the hard way.
In any case, there's nothing particularly noble about empire per se. Sure, it pleases the ego. But there's always a bigger empire. And empires require HR departments and middle managers and other such distasteful things. You don't need to be the captain of an aircraft carrier. It's also fun to run a pirate ship.