If you do this, throw them on the neutral AH; many people do this, but they're still worth about 900g, more if you're lucky. You don't get charged for them as well, so you can just keep putting them on the AH until someone buys them.

And thus begins the circle.
I'll reveal this tid-bit. Alliance pets sell for more on the Horde Server. Horde pets sell for more on the Alliance Server.
That's just common knowledge.
Doing so requires two accounts or a trustworthy friend to make the transfer on a nuetral AH.
And you take a chance that someone scouring the nuetral AH might snake the pets during the transfer, but if you time it right, and make the transactions during on off-peak time, say, early in the morning, you should be ok.
Now you sell two Alliance pets on the Horde AH. Then buy 3-4 Horde pets and transfer them to the Alliance side.
Rinse/Repeat.
In this sense, you don't even have to do the Argent Tournament dailies, just have the capitol to start the venture.
Personally, I'll stick to selling greens on my server as our economy is jacked up beyond reason.