IB gear = fake 310s which means you are booted from my fireteam.
IB gear drops at 280 so you will have to infuse your way to 310 which isn't worth it. Plus using IB gear in the raid is worthless anyways.
Edit: only true year one vets know what I am saying. See all the salt posted below!
Edit 2: updated satire tag. Salt game is strong!
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The thing you fail to realize is the IB gear usually has great pvp perks as opposed to raid gear that has good pve perks. For example the raid gear give bonus such as extra orbs on a taken gernade kill but in pvp that's useless so you want something like increased melee speed or more gernade energy from melee hits etc.