If I speak to people that have been doing the raids for the majority of the time, they speak about hundreds of shards and energy. Not to mention their reaching Level 32 earlier and having weapons generally superior to counterparts in the Iron Banner, or via crucible drops.
Its an unreasonable im-balance in player performance/acquisitions.
I think Destiny would do well to either: (1) close the gap by greatly increasing the rewards for playing in crucible; or (2) just straight out announce that destiny is a Raiding & Nightfalling game and the Crucible is just an ancillary activity, so if players prefer the crucible, they should look to another game developer.
EDIT: The reasons for Raiding or not-raiding are inconsequential.
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I'm a PvE player almost exclusively, but played PvP with a group in Iron Banner. Six man team, we were. Everybody but me played Iron Banner to get to level 32, saying how easy it was to do in only a few days. So, I think PvP (at least in IB) has advantages rather than disadvantages. Regarding the weapons, the CE raid weapons aren't that great, as you'll see by reading the forum posts. Most CE weapons have better Vanguard equivalents available for purchase and that's probably true for Crucible stuff as well.