What don't they get? They brought back Active Roaster from Halo 2 as it was a feature that folks wanted and was sorely missed, apparently. They didn't bring back the Clan support from Halo 2 because the usage of that feature in the online community playing the game was less than 10% (can't remember the exact number mention offhand).
I agree that teaming up with friends and facing off against other teams in some kind of clan format would be cool but the feature wasn't heavily used when it was available so there is hardly any reason or justification to bring it back when there's other priorities for the game.
Don't bother. People were exploiting the site for discounted hardware and software (as per the rewards system from the Program). They cracked down on fake accounts by asking folks to send in scans of their pay slips for verification.
Plus any code from there could easily be traced back to you when you use your Xbox/GT to redeem it, not too hot if they decide you've fooled them.
Additionally, just because they are receiving code in April, doesn't mean they were get early Beta access. The codes could be simply sent out in advance with details to redeem them come May 3rd like everyone else.
Not worth it.