40 Euros for a deck of cards is a bit steep. I've backed card kick starters before, usually around the ~12 Euro mark.
Hello, I'm the creator of this game. I understand your feedback about the pricing. There was some early bird pricing for one deck but it's all gone. The best thing to do is to grab a friend that could like the project and order a double pack with the early bird pricing.
FYI, it's a double deck of cards and more a serious game than just a nicely designed card game so the usual pricing is around $30 (check the brand deck or Pitch deck on kickstarter).