How much does it cost to adminster a podcast?

Now, we have no problems with people who make podcasts deciding they wish to be working on a commercial basis and charging a fee. What is a little odd, though, is the UK commercial radio's RadioCentre podcast pages, which offer a range of programmes charging what they call

a small administrative fee

That would be £12.75. Now, unless they're sending a bloke round your house to put the track onto your iPod for you, I'm at a bit of a loss to see how there could be £12.75 worth of administrative costs involved for every listener. If you're selling something, say so; don't pretend you're barely breaking even.