1. No, since most of them are just normal armour with bloodlust added to them (and yes bloodlust is useless). But if you want drip then you can buy them.
2. Max out reload on your bow 1 (Greek skin)
3. Gatehouse has a lot of reach but low damage. With bow 3 it’s good since you can combo shoot>poke since bow 3 brings down enemy health a lot. But on bow 1 I wouldn’t recommend it unless you land all three shots consistently. The brown meta one has a good balance of reach and attack, the godendag has a lot of attack but low reach.
4. Meh, up to you. If you want to see cool Easter eggs then sure. If not then don’t buy.
5. Stun is worth it. But don’t use it on single-shot bows like 2, 3, 4, 6. On bow 1 and bow 5 it’s good.