I don’t see anything good coming out of this if they decide to refund the purchases public relations wise. On the other hand, if they honor the purchases it will be win win! And here is why I think so.
I purchased a copy for my girlfriend after one of her friends was asking me about the game and noticed the price at $3.75. I figured they were running another awesome sale and jumped on it as did she.
In my humble opinion, it would be better to allow us to keep the purchases and give us game codes as many of us are going to be gifting these, and or playing for the first time. This in turn will get new players into the game, (or even veteran players) who will then spend more money at Black Lion Trading Company.
It will make us happy and we will happily go about spreading word of how awesome Arena Net is! It will make the new players happy because they get to play at a steal of a price for an awesome game!
Arena Net has been nothing but awesome and I can only hope that they will honor that price, even if it was a mistake.