If you really care about frequent flier miles, you end up doing all sorts of crazy things. The simple stuff is or organizing your flight schedule around high-mileage promotions — but soon you're using dummy transactions to pump even more miles out of the card or buying an empty seat on a flight just because the miles are worth more than the cash.

Once you get a taste for it, you spend an alarming portion of your time concocting more of these schemes, and scouring forums like Flyertalk for tips on any mile-churning tricks you might be missing out on.

This week, the Oxford Internet Institute published a new paper on the internet subculture of mile-churning, and it's a surprisingly good introduction to the subculture.

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You'll hear about the infamous Phillips Pudding Gambit, in which David accumulated 1.2 million miles by purchasing 12,150 cups of pudding that had been erroneously marked as individual purchases, thus achieving a legendary cost-per-mile of .25 cents.

There's also the less well known Emmi Cheese Contango, in which a consortium of speculators purchased 1260 wheels of Emmi Swiss Gruyere for a slightly higher CPM of 1.2 cents.

There's also the well-worn trick of buying things that look like purchases, but are really transfers, like dollar coins or money orders. Apparently as much as $12 million in Kiva funding has come from high-mileage credit cards, an unexpected boon for the microloan business.

Of course, most of that value is coming out in the form of credit card fees. Merchants are paying 1.51 percent plus ten cents for each Visa transaction, some of which gets shuttled back to the consumer in the form of miles. But it's a nice trick while it lasts.