You need to consider reporter bias as well. Someone who gets something they consider exceptional or something they're happy to get is more likely to want to tell people than someone who got nothing of interest.
Admittedly there's no way to measure that unless someone has an equivalent data set with all the drops (there used to be an addon to record all crown crate drops, but I don't know if it still exists or how many people use it).
On the NA I got a few things I already had, so gems.
On the EU however I got the wolf from the second crate.
Like I said in another thread, you can sometimes get some really nice stuff out of a free crate.
First crate had a gold card... that was an exp scroll worth 33 gems.
Second crate had a blue card... that was an emote I already had worth 5 gems.
So... a bunch of gems.
*shrugs in "free stuff"*
We'll see what the other 3 alt accounts/servers get when theirs come around in a couple of days.