The Guild Wars 2 key I bought activated with no problems. However, it will be disabled after a few weeks because it was bought using a stolen credit card and resold to you. Here is the email from *******@guildwars2.com:
The Guild Wars 2 Serial Code that you registered was originally purchased from our website https://buy.guildwars2.com/. This purchase was made using a stolen credit/debit card and was thus flagged as a fraudulent charge. This resulted in the provided serial code being permanently disabled.
And if you think you're safe because you paid with Paypal, think again. They closed my dispute without any refund and the reason that the product is intangible. I can't believe that in this day and age, buyer protection does not cover software or keys purchased off the net. Paypal should update their policy otherwise there will be more scams because they let the scammers get away with cases like this.