Summer blockbusters/movies?

Question

Why do they announce when the summer movies come on DVD and Blu-ray so early?

Answer 1

so you don't get 200 people on here asking " when does >>> come out on DVD "

only 50  

Answer 2

so people know when to go get them

Answer 3

so people can preorder them, and eventually they get more money out of it...

its like a cheap scam...