This guy's a piker, at least in pure volume terms. Go to Amazon and search for "Jassen Bowman" and get a look at the results: 143,056+ listings, for audiobooks (on CD) with titles like,
Learn the Hair Lotions Online Business Networking Secrets. I'm guessing that all the CDs are either identical or lightly templated, assuming that they exist at all. (Every one I've seen is marked "currently unavailable." The trick here is probably generating all the listings via some kind of bot.
A nice short discussion of this phenomenon is available
here.
Parker is mentioned in that same blog entry. To make a living it only takes a couple of "what the hell; I'll try it" sales per title when you have that many posted.
Complaints have been lodged with Amazon since early 2007; one would think that an online retailer of that size and sophistication would be on to them by now.