The release of the last Harry Potter book and the assured success of it (12 million books were printed for the US alone) got me to thinking about return on investment. Specifically, the return on JK Rowling’s investment (of labor/time), which has to be among the highest in the history of creative enterprises. Let’s look at some rough numbers.

  • Harry Potter books have sold 325 million copies worldwide, making JK Rowling a billionaire and the wealthiest author in the history of literature. I don’t know what the average price/book is but let’s be conservative and say $10. Amazon sells the hardback for $18 as a point of reference and the MSRP is $34.99, but I doubt anyone is actually paying that price unless they’re buying it in an airport bookstore or whatnot. Paperback sales also cut into the average price quite a bit, so I think $10/copy is probably within the realm of reason. That’s $3.25 billion from the book sales alone (all of which is certainly not going to JK Rowling, lest anyone think I am implying that).
  • JK Rowling spent 17 years writing the 7 book series. I doubt she put in the equivalent of steady 40 hour work weeks writing during that entire 17 years (I’ve never met an author who can legitimately claim to productively write 40 hours a week year in year out) but let’s be generous and say that 17 man-years of work went into the development and production (not including printing, marketing, and distribution) of the HP books.
  • World of Warcraft cost, I believe, somewhere between 70 and 80 million to develop (not including manufacturing, marketing, and distribution) and had a team of upwards of 100 people. The current dev team for WoW is 135 people according to Gamasutra. I’m not sure when development on WoW started but given that Blizzard first announced WoW in 2001 at ECTS (European Computer Trade Show) and had gameplay footage there and at E3 that year it must have started development in 1999, at least. It’s likely that the WoW team size averaged at least 80 people on average for 5 years, or 400 man-years of work, at minimum.
  • I’m willing to bet large amounts of money that the average person working on WoW did in fact work at least 40 hours a week, so even while comparing oranges to apples it seems certain that WoW cost at least 20x the amount of labor that Harry Potter did. I suspect the real figure (factoring in the amount of work done rather than just the (amount of time from start to finish*average number of workers) is more like 50-75x as much.

That means that if we just look at the book sales for Harry Potter (merchandising is easily 1-1.5 billion/year and then there are the movies, each of which has done very well) in terms of return per hour, they have earned about (using my very very rough estimates) $191 million for every man-year of labor put into them.

For WoW to hit such a ratio it would have to produce, in total, $76 billion (and again that’s without including HP merchandising, which certainly dwarfs WoW’s, or the HP movies). Currently, WoW brings in about $650-700 million/year plus box sales, which have added a few hundred million to the subscription and Asian net cafe figures. In other words, WoW would have to run for about 100 years at the current activity level to match the revenue/man-year from the Harry Potter books alone. (And of course given that a dollar today is worth a lot more than even an inflation-adjusted dollar in the future, the real answer is that WoW would have to run a lot longer than that to give the same return.)

Disclaimer again: Many of these numbers are estimates. Informed estimates, but still estimates. I’m also comparing apples and oranges to a large extent since WoW has enormous support costs that Harry Potter does not have, but similarly WoW has enormous recurring income that Harry Potter books do not have (though Harry Potter merchandise and the movies probably more than make up for that).