I've looked everywhere but I can't seem to find a full explanation on it. Do you unlock the Tiers from just buying AP or do you actually have to spend the AP to unlock each Tier? And say I unlock all four tiers, do I get to pick an item at each of them or do I only get to pick from one of the Tiers? Any help on this would be great, thank you.
You unlock tiers by spending AP, lets say there is a tier named "Test Tier", the tiers are
Tier 1 100 AP - Reward: Box1(male) OR Box1(female)
Tier 2 250 AP - Reward: Set1(male) OR set1(female)
Tier 3 500 AP - Reward: Bananaboat or Helicopter
Tier 4 1000 AP - Reward: Supershotgun3l1t3
So lets say you buy something in the item mall, for example the "Bananasword", price is 150 AP , now that you have spent 150 ap, you'll get either Box1(male) or Box1(female), and if you buy another item, the "Crooked Hooked Cheapy Rustsword", which costs like 400 AP, you spend a total of 550 AP (150 + 400 = ?), and you'll unlock both Tier 2 (250 AP) and Tier3 (500AP), which means you'll get a Set1(male) OR a Set1(female) AND the bananaboat, because you wouldn't choose the helicopter now, would you? >: (