I know when I record my own podcast (shameless plug -
http://mygenerationpodcast.com) that I try to keep myself on the mic. I also monitor through a pair of headphones my output or my co-host's output, so I'm hearing almost exactly what my listeners would hear.
The problem is that a lot of hobbyists don't know how to set up a monitor out channel, or think that they need to, and so you get a lot of them that are speaking "off mic", i.e., they're directing it across the top of the mic, rather than into the pickup, or off to the side, or they're holding the mic too far away from their mouths, or whatever.
Best recommendations I have, if you are doing your own, are to set up a monitor out into a pair of headphones, so you can hear yourself; and, in addition, know how your mic picks up, as not everything is omnidirectional (nor do you WANT it to be if you're recording a podcast and don't want the ambient noise!)