I've worked as a salesperson since I was 17 (I'm 22 now), on and off. Pays the bills, you see. And you're 100% right about the amount of exposure you get to every day people, however instead of making me jaded, I believe it's made my life as a developer easier; it gave me insights into regular people I think I would have otherwise missed.

And gave me a neat startup idea I'm working on ;)