ofcourse you can choose what your going to use after merge.. if server1-3 were going to be as 1 server ofcourse i have account also in s1 s2 and it will be deleted cause im choosing server 3 as my main account after merge.. and definetely my account on s1 2 what i have purchase there will definetely get a refund and going to my s3 aaccount all i have prchase will be converted to diamonds and it will be put in s3 account.. this is like example of merging from other games i played right now