I have to say I kind-of disagree with you
I realize that, yes, things SHOULD be kept 'special' and 'exclusive'...but only when its atleast SOMEWHAT fair to do so
Yes it's just a cosmetic vanity pet - I don't care, I want a monkey!
I think ZoS is choosing a bad time to be giving these monkeys out, and I think you are as well.
In your case, you think that "only those from septembers beta should get it"
I (and I'm sure many others) signed up from the start, and simply because I was unlucky to get the beta I am also somehow uneligible to get the 'exclusive' monkey pet?
I'm sure I'm a bigger fan than atleast ONE of the beta-testers that 'just happened' to get a monkey, and that is somehow fair?
Now, on the other hand ZoS shouldn't be handing these out NOW, because there are so many 'free giveaways' where everyone and their grandma can get a beta-key, so now the game will just be watered down with tons of monkey-pets...even people who aren't 'real fans' and who didn't signup for the beta (signifying their interest in the game) can get it.
In my opinion, they should have just given a monkey to everyone who signed up for the beta 'officially' X time ago (where X can be, for example, from before the first-ever beta)...not whoever got in to the beta at timeX