Hey guys this is just a small little gold tip that alot of people may already know about, this is to help those who don't.
First off since Mists launched companion pets became account wide and many of them are auction-able. Now knowing this it should come to you that it is very easy to buy a pet on 1 server/faction and easily transfer it to another, sometimes for a very good profit.
Example: I used to play on illidan so i have a 90 there with some gold, so what i did was buy a pet that now semi-rare on sargeras and flip it for 6k profit. And I can now easily make 15-20k a week just selling pets.
Gold is Gold!
Why not have some if you wanna change servers!
Hope this helped someone.