Bohemia Interactive has the right idea for pre-ordering with ArmA 3. If you order now (around 6 months before release), you get the game for 25 euros. That includes alpha AND beta access. If you buy it in beta phase it's like 40 euros. And full retail price is 50 euros. Very good idea from them tbh. They know the buyer is taking a risk by buying a game before hand, not knowing how good it's gonna be. But in exchange you pay less. And Bohemia gets alot of feedback from the Alpha. Win-Win situation
