1. It cost a whole $5.
2. I want more information before I form an opinion on the game.
3. I have friends who play.
4. Destiny, in spite of many flaws, is one of the best overall values in gaming I've experienced.
5. I'm not afraid of it changing in a sequel.
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It's not a beta. It's a marketing tool to lure people into preordering a product they will never be able to test before it September.