Well, considering NCSoft is an international corporation... you can simply compare the revenue GW2 generates to other publicly traded MMOs. Should see something to look at in NCSoft's Q1 2013 report (provided the world doesn't end). The 1st quarter will have most of your box sales. The 2nd and 3rd quarters should see declining revenue given the tapering off of the box sales. Somewhere around Q3 or Q4 you'll be able to see kind of what the revenue stream might look like. By the end of 2013 and well before a paid expansion release, you should be able to see the effect the financial model has on NCSoft's stock value and/or as they release statements to the media.