Ok, ok. It isn't this scary, but it might be....Can you handle it? Can you?
Purchasing/Selling from both Alliance and Horde. Now alot of people are familiar with this style of play, but since Cata there is alot of focus on playing your own AH, and little checking "the dark side" to see your competition over there (I know, because for the first week, I did nothing but Horde AH, and at the first sign of MAJOR competition, my instinct took over, and I logged into my Ally).
Before I go into this too much further, log into your account, and check your higher selling items on the cross faction (no, not the neutral AH, the "other" side). Is there a significant difference? Like Jasper going for 35g and on "your" side it's only 9g? Is the Cinderbloom reaching 40g per stack when you just bought 50 stacks today for 95g? You see what I mean here? If they are all the same (or near it) just bypass the rest of this post. Although it's very unlikely that there isn't some niche you can get into.
"But Alto, I don't even have a toon on the other side"
Start a new toon. Get your new level one to a "main" town. Thinking back, I believe Alliance closest is Gnome, and Horde's is an Orc. Get to the AH and check the prices (if you use Auctionator, just click on your buy tab and it will remember what you have searched for on your "main"). See what you can get yourself into....*time lapses*.....
"Ok, I found Cinderbloom is waaay cheaper there. Next"
Talk to a friend: Your best bet is to have another account of your own to do this. However not alot of people do, so here is what to do: Do you have a guild buddy that you trust? A "real life" friend that you know has a wow account (maybe doesn't play on same server)? Give them a holler and ask about assisting you moving gold over to a toon for you (unless you can "trade" money with them if they have one over there already). Just make sure that you cut them in on the first round of gold you will be making (you should already have an idea of your first profits, so base your "tip" on that. 100g? Sounds good to me).
*Now if these options are not available, you can always take your toon and send a tell to the seller of the goods you are looking at. If they are not online, send them a mail. What I have done in the past if I need a quick move is /2. When someone is "barking" their wears, send a tell to them (with the 100g tip I mentioned above) to send it through the neutral AH. I can normally convince someone quite quick to assist me. Money talks. And you might get lucky enough to have a cross faction farmer out of it as well!
Now is where you might run into a few issues. If you end up using the Neutral AH for moving gold (which use at your own risk, I would only move no more than 10K, as that will be enough to get the ball rolling quite quickly). Have your pal toss up an item (junk) for 10K on the neutral, you buy it from your main, the goblin AH takes it's cut (still 10%? I think it's close to that- *Edit- Thanks to Tyrandir- it's 15%) and your buddy has your cash in their mailbox. Log to your toon on the dark side and start your cross faction.
Now make sure that your initial "tip" makes it worthwhile for your "friend" to help you move the gold/items over. It gets a little more complicated when you are getting ready to move your 100 stacks of cinderbloom.....
"Ok, Got my 8400g on my new toon, tipped 100g for my helper, I hit the AH and bought some netherweave bags for holding, bought bank tabs, and now I go to the AH and there are only 50 stacks left. DAMMIT!"
Yeah, that does happen. Figured I would add this in....
"Bought my stacks, now I gotta get them back over"
EZ money. Holler at your buddy (i use vent for this, or over the phone) get in sync (not the band...) and list 5 at a time, buyout. 5 at a time, buyout. If there is a "scalper", they won't get away with much.
"Thanks Alto, but I have another issue. I did this a few times, and am outta money over there."
I hope you would have already figured this one out. Either shuffle more money over there like you did before, but that is where the "cross faction" comes in. You buy/sell both sides, Horde wants Cinderbloom, Alliance wants Pyrite Ore. You get the picture.....
Now there is alot more that I can cover on this post, but I hope you feel where I am going with this. Feel free to leave a comment on something that worked for you, or if you have other questions about this style of play. Till next time.....