Guild Wars 2

Hi , Can you tell me why the Master Armor merchant in WvW is BOA and Not Account Bound ? I use my Ele to buy some medium armor for my engineer . and now i am stuck with 3 pieces of armor that can’t be use. please give me a solution on this. i seriously don’t understand the BOA thing. Why can’t i use 1 character to buy armor from WvW for my other character. i mean its still me that is playing !!
I’m sorry if this is not the place for this problem. but i need a solution because it don’t make any sense to have this BOA merchant in WvW. Thanks

hi, i just bought gems and tried to buy the chest keys from the trader , it deducted my gems but i didn’t get the mail for my keys . i bought 3 × 5 keys and 1 mini pets set and 1 character slot. i got the character slot . but not the keys and the mini pet set. pls help. thanks