Fifa 14 Xbox coins for PS3?

I have 3.7 million xbox coins, wish to trade them for ps3 coins.
If you got a lot of ps3 coins, i would love to send 5k coins one at a time by bidding on each other's card.
Like you bid 5k on my card on ps3 then I bid 5k on your card through xbox.
We skype through the whole session until I give you 3.7 million.
This way none of us will be scammed.
I don't have time to mess with people who want to steal 5,000 coins from me. The 5k is nothing but the time is everything and don't want to have my time wasted. Can do any increments. If you only have 100k then that's fine. Just want to start playing on ps3.
Won't go first for new users.