serpantino: You haven't shown me anything, it's a blatantly obvious fact that 60% off $9.99 is more than $5.99 and yes in the rare instance I want both I will vote tactically. This looks like nothing more than another 'Vote Gothic' post. I'm sure most GoGers have the wits to work this basic mathematics out themselves.
For me it looks just like a fun thread where someone is playing around with some calculations. Of course it's more then obvious that voting for the more expansive item makes from a tactical point of view more sense. I wouldn't take it too serious, enjoy the math and see it just as a little forum game and not as a recommendation or an order. I'm sure most of us know for what game they vote, and that is very likely more based on desire and not math ;-)