We pay to host our podcast on Libsyn (that's how it gets to iTunes!) and our website on Wix. We also pay a subscription fee each month for Adobe Audition, our editing software. Plus, we just bought a fancy and expensive new microphone (the one Michael Jackson used to record Thriller, not kidding!) so you can hear us better against the highway noise.
Basically, there are lots of expenses associated with making a high-quality podcast, and we deeply appreciate your support in helping us make it. We do it for you!