I've already been on viagogo, and all the easy google search results, for the past few days. Once you get to checkout there is an extortionate booking fee added, plus vat, plus e-ticket delivery fee, bringing the total to €625.24. I stated around €500 for the bounty. Its not that easy!
Good luck with that. Viagogo has the cheapest tickets available now. There is no way you will get 7 tickets for 500 euros (incl. taxes etc) unless you want to stand outside in the parking lot.