Yeah, I listed those reasons for the sake of it, and so as to see if there was any incentive to win friendlies (other than out-of-game feelings). Somewhere I read that a player who scores during a match gets better chance to increase his XP than a player who doesn't score. Other than that, I don't see any reason to win friendlies, but of course, if there is a possibility to win, I'll take it.
Shabba, OK, I'll report weird trades in the future, I just have to read again how to do it. But I won't lose my time doing it on purpose, only if I stumble upon that. I'm not one of those who like to tell the police when it's none of my business.