Would they be here if they weren't? 
I figure that the real difference between me and them is the ten years I have invested in the business, paying tax on the earnings that I have never seen because they all go back into the biz. It could all go to hell tomorrow, and they would be none the worse off other than having to find another job. I will have suffered for ten years carrying the weight of responsibility for the health of the Company and its employees, and would have been financially better off managing a fast food restaurant all that time. Yeah, I pay myself a better-than-average salary, but at the end of the year I don't even take home as much as my best employees, due to the excessive tax burden on small business "profits". 
So I'm a gambler - betting that I can create and maintain something that will eventually be worth more to someone else than it cost me to create and maintain it. Not a smart thing to do on the face of it...
(On the brighter side, there are a couple of multi-billion dollar companies sniffing around us right now... fingers crossed. Not particularly optimistic, but hopeful!)
Still not clear if this is capitalism or "just" business.