I guess the profitability depends on how much you pay for electricity as I  presume it's not worth mining scrypt on a botnet now there are scrypt asics.
One possibility is that some people want doged anonymously rather than going through an exchange. It would be interesting to see if a shapeshift like service on tor would get any business as with the sell orders on the exchanges it doesn't seem worth doing any mining if you just want a load of doged.
Another mining question, are there any plans to merge mine with litecoin like doge does so it has a huge hashrate to protect against 51% attacks?