We talking about more than 1 300 000$ !
That may be enough money to cause you to do the dishonorable thing, Reyhs, but not everyone's honor can be bought so easily.
But you can not argue! So far, no payments. 5% and down...
You must not have been mining long for this to have lost (delayed) 5% of your total shares rewarded. How long have you been mining on Eligius?
edit: The top contributor's stats are right here.
http://eligius.st/~wizkid057/newstats/userstats.php/1Nbq2XZaRsKknf5fcT2wTXvBS31PaUWSeX He has 200 less BTC unpaid than you claim to have. So unless you're miner with nearly double his hashing power, I don't see how you could have 500 BTC unpaid.