Considering you can't hit 31 unless you buy tower gear (or get super lucky like my level 25 Warlock did, instant 31 just from drops while playing my hunter) then I don't see what the issue is. You can't beat the raid without a 31 which means you or somebody in your party had to buy gear.
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The raid has been beaten with no 31 and a few 29s...
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No they had all 30+ including 31's they even said it. They just put on they new gear at the end to take a picture and that's what made it look like there were 29's