I can't imagine that what you're asking for is a trivial task for any server or group of servers. I can't even begin to imagine how many attacks are being made with dots and everything every second in game. Then having to link that data to ilvl and weapon ilvl for every single character online then finally average it all out. The amount of processing power for every interval that the servers are polled for such data, assuming they are even logging it at all, and asked to compile it into a meaningful form can't be trivial.
Look, I don't want to imply that all "proparsers" are horrible evil people. I just feel that parsers can potentially do much more harm than good and the sort of fight club (First rule of parsing is you don't talk about parsing) status of them currently is the best way for it. Either way, Parsers are not the magical wand that will fix all problems in FFXIV as many of the "proparsers" in this thread seem to think they are. I honestly don't think I could enjoy the game with a public parser available to everyone and I know it's a horrible example, but this is the feeling that comes to mind:
Let's say the US government implements an opt in Anti-Terrorist plan where you can have microphones installed in certain rooms of your home (bedrooms and bathrooms omitted, naturally) and a website would track and parse partial logs of what happened in your house to prove you are not a terrorist and everything. Well, you have nothing to hide so you opt in because OMG terrorism is scary right. Then one day you're at the line at the supermarket and some guy says, "So I heard about you yellin' at your kid for not doing his homework the other day." Wouldn't that weird you out?
I dunno the idea that someone is monitoring my game play constantly whether they comment on it or not just makes me feel uncomfortable and it would distract from my enjoyment of the game.