Like a lot of IT people, I came through a different field - public relations in my case, specifically political consulting. That's a very good way to starve, so I went for a career change. I started into IT shortly before the .com crash, but stuck with it afterwards, working for an IT startup in the basement of tortilla factory. Tough times, but I learned far more there than I ever would have seeking another degree.
Working for a small company gives me an opportunity to wear many hats, and the skill mix of IT and marketing works well. I have a lot of freedom to come up with innovative strategies in using technology to bolster marketing and sales, and track them closely. A lot of marketing people don't know what information can be obtained by IT, and a lot of IT people don't know what data is useful to marketing. Having the same person do both solves that.