I remember than in May 1st i had 50 possitive iTraders. From then i received 7 new possitive iTraders but i see i only have 54 in total. simple maths: 50+7=57 not 54 right ?
If you have an individual that submits more than one itrader in a single thread or transaction, it doesn't count towards your score. OR atleast that's how it seems to work for me anyway.
this is how it works. you get one + with each different user you trade with. if you trade with the same person twice, it only counts once. for instance, i have 175 iTraders, with 175 different users. my overall iTrader is 203, only because i have traded with the same person more then once.