Press ESC to open the ingame menu. Click on Statistics. The amount of Kills will be listed there. (Resets every time you close MC)
We had statistics on pvpfest for a short time a while ago, all it did was encourage Admin donors to ruin the experience for default players (and for lower donors). It will not be added back.
Get their kills up.. Regulars easy prey, just something other flying around randomly and killing people, they would actually target regulars/lower donors because they're easy to kill and wanted their kill stats up.
Tell me how having a scoreboard encouraging Admins to kill regulars has anything to do with the economy ruined..