Couple of notes:
The cupcakes are being sent directly from Fuss (the company) so no risk of angry fans tampering. It's perfectly safe for Bioware to accept them. I think they would have said on the thread if they didn't want them, or locked it.
In addition, the mods/devs seem pretty chuffed about it - several of them have posted to the thread to say "this is awesome" etc. So no hard feelings around, maybe it'll help to dispell some of the negativity currently on the BSN. Since they're following the thread presumably they also get the joke - some of them have tweeted about it.
twitter.com/#!/BioEvilChris/status/184426281243377665
"Creative cupcake protest respected and appreciated. Still, would a creative "send Priestly a protest Porsche" be too much to ask? #greedy"