Let’s turn this into a scenario: I heard a friend of mine likes crab cakes. Since I wanted attention, I went to the grocery store to buy lump crab meat and the other ingredients to make them. I then invited them to come over for dinner, but it turns out they already have other plans. Should I try to sue them for the money I spent on those expensive ingredients? No. Should I even expect them to just give me money because of an inconvenience? No. Because that would be incredibly stupid, and isn’t their responsibility.