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afron just my opnion sir, gms that assist players are not available on time. Few months i read a post that the player is very mad because the trade has been cancelled due to gms are not available. Players are taking risk because of that reason. For me, your news is not good. You can do that if all the gmta are available on time. Most of the times, gmta will comment on the assist after 5 hours and will say still up? Do you really think that the assist after an hour still available? Ofcourse not both players have the time to wait for that assist.
Before you make a rule that only 50-60% will be returned, check on your admins end if the you dont have a mistake. If gmta is available 24/7 why not make that rule? If not then consider the status of players that taking the risks because gmta is not available.