I work for a large company in sales (800+ employees) and i can tell you one thing, a good salary doesn't always get the "best" work. I've worked at this company for around 3 years now and am now on a higher wage than when i started, however poor bi-annual bonuses for meeting targets aren't enough to motivate me- and many others to reach sales and profit targets. Don't get me wrong, we work hard, but for me personally, if I were getting some kind of sales incentive based on what I sold I would be 100% working more in my own time trying to bring in new customers and make more sales. At the moment, I feel as though I turn up to work, work flat out all day, knock off at night and that's it. If the incentive structure were different, I can guarentee I would be "on the hunt" for customers and possible sales if the rewards were there.
Having said that, I'm looking at owning a business of my own, whether I buy or start my own, I enjoy the business and finance side of things and that would give me a good balance of what i enjoy. For me personally, I would have the motivation and drive to "move forward" as the money is going into my pocket rather than a big company which pays a flat wage.