Each person is free to choose which actions to perform. I wanted to calculate EV given that the new 5-mana summoners have a really high value and I felt that there is a lot more value now than before.
Not the general prices went upwards, but specific one as I tried to outline in the consideration section. Cards like Peaceful Giant are almost 3x what they were a couple of month ago, meanwhile other cards lost a lot in value.
Thanks for your comment on the post, glad you enjoyed it.