You can sell nothing for a mark-up for a while, but only until something starts eating away at it. Now I can go home and click on Yahoo, call my sister and talk over a microphone for free. ↗
Also, from a technical point of view, as you're standing in front of a microphone all day, it's quite a good idea that I should play a laid back sort of character because if he was too frenetic, I'd be exhausted by lunch! ↗
I'm still excited at being at a microphone and talking to listeners. I love that. It's the most basic element of what I do and I still enjoy it very much. ↗