In my case, I do it to ensure they'll hold a copy for me at the store for whenever I can get down there to grab it. Gives me the peace of mind that I'll be able to actually get it on release day without having to wait.Then buy it once it's out. If you're buying physical then it takes the same amount of time to walk in the store and pick a copy up. If you're buying digital then there's literally zero point to ever pre-ordering.