[quote]I guarantee if you read the Terms and Conditions it more than legally covers them on this. Probably not the answer you want, but I understand your anger.[/quote] I guarantee you it doesn't. It's actually against the terms.

SERVICE PROVIDED CONTENT: “Service Provided Content" consists of those materials provided to Program users (e.g., unlockable content, accounts, stats, virtual assets, virtual currencies, codes, and achievements) in connection with use of the Program. [b]While the Program may allow you to “earn”, "buy", or "purchase" Service Provided Content within or in connection with gameplay, you do not in fact own or have any property interest in the Service Provided Content[/b]. Unless otherwise specified in writing, any Service Provided Content that you receive is licensed to you as set forth herein, and you shall have no ownership right thereto. Unless specifically permitted by Bungie, you may not, sell, lend, rent, trade, or otherwise transfer any Service Provided Content. Service Provided Content may be altered, removed, deleted, or discontinued by Bungie at any time (e.g., upon termination of this Agreement and/or cessation of online support for the Program), even if you have not “used” or “consumed” the Service Provided Content prior to alteration, removal, deletion, or discontinuation. Without limiting the above, Service Provided Content may include virtual coins, points or other virtual currencies (“Virtual Currency”). By purchasing or otherwise acquiring Virtual Currency, you obtain a limited license (which is revocable by Bungie at any time unless otherwise required by applicable laws) to access and select from other Service Provided Content. [b]Virtual Currency has no monetary value and does not constitute currency or property of any type[/b]. Virtual Currency may be redeemed for other Service Provided Content only, if at all. Virtual Currency cannot be sold or transferred, and cannot be exchanged for cash or for any other goods and services, except for other Service Provided Content, where applicable. Subject to applicable local law, Virtual Currency is non-refundable. You are not entitled to a refund or any other compensation such as Service Provided Content for any unused Virtual Currency and unused Virtual Currency is non-exchangeable. While it doesn't specifically cover this exact scenario, it does make it abundantly clear you do not own any digital currency in D2. I skimmed through the other sections and there's also a class action waiver, so everyone would have to submit individualy.

[quote]Bungie may change and update Online Services or Service Provided Content without notice to you ([b]provided always that any such changes do not result in material degradation in the functionality of the Program or any [i]Service Provided Content which has been paid-for with real money[[/i][/b]).[/quote] Offering items that double XP combined with displaying incorrect values for throttled XP most certainly falls under this statute. Any person(s) who may have purchased 3rd party items for the explicit purpose of getting bonus XP codes and didn't receive said bonus were defrauded by paying for a product that functioned differently than what was advertised.