Forgive me for throwing this question out here, but I've not seen a decent explanation for where those ridiculously high electrum rewards come from when you EM in Platinum. I had one myself that was something like 3K. I didn't notice how highly my opponent was ranked, but at the same time, the only equation I've managed to find for electrum after winning an arena match didn't seem to take into account the ranking of your opponent.
I'm sure I'm missing something, somewhere....if anyone can point me in the right direction, I owe you a doughnut.