i got about 314 and 310 coins on 2 servers.
no package bought, quest reward equivalent (items sold immediately if gotten by other sources) went into 3890 and 3560 extra coins.
taking your "1344" coins from quests, meaning i got 5234 and 4904 coins. this means that, for me, one diamond is equivalent to 15,82-16,66 coins (avg 16,2441)
in terms of the package:
taking your "623 coins from goods" + 350 + 7*16,2441, i get about 1086,71 coins, which is the equivalent of ~65,23-68,69 extra diamonds from the event.
since the top-1 person had ~340 on both worlds, it not only did cost me the win, but that also means that they bought 20% of their total diamonds by real money, and this is the top position.
this is like you could pay 20€(25$) at the end of a game round to instantly get 20% pp on top of your current pp
i have to say, thanks for ruining a fun competative event with another buyout option