We aren't talking about a marginal ping difference though, are we? it was a difference of anywhere from 10ish to as much as 25-30 for some. That might not sound like a lot, but once you cross 100 every additional 10-20 ping makes a very noticeable difference. It was also enough to prevent the team captain and star archer from being able to play on the EU sets, putting NA at an absurd disadvantage.
I don't wish to start a debate on what could or would have been, but it should be obvious how a decision like this would have a massive impact on the result of a match.