It's not ignoring what you said, it's taking it into account; you are artificially excluding values from the calculation based on your own biases.
To be clear, this is fine. There is no reason you should keep paying for (or even playing) a game you no longer enjoy, and a lot of things to do with money do not inspire RATIONAL feelings, which is fine. Just because it is mathematically a good idea to buy the Adventure if you're already inclined to keep playing does not mean it's a good idea to do so if you're not already invested in the product enough TO do so.