Those spam emails you've been getting are right – size matters.
"Podcast hosting" isn't unlimited. And more and more people are getting their podcasts directly to mobile devices. Because of these things, the size of your podcast file matters – you want something that is quick to download and won't take up too much space in your hosting account.
More info on how to get the smallest (and best-sounding) podcast file in this episode...
Don't Let Your Podcast Be Ignored - Download my free "Audience Attraction Cheat Sheet" to get 25 podcast episode (and segment) templates.