On VeCo, my bank alt has more than doubled his money and is now well over 50g. He's running a little low on stock though since my hunter hasn't been out and about gathering stuff and I don't yet know the market well enough to be heavily investing back into the market. I've made a few contacts with various people in /trade who may supply their unwanted "crap"... some of this can be turned into gold!
On Cael, my friends and I did a bit of cross faction trading. We bought a bunch of items available only to one faction and flipped them over to the other via the neutral AH. I have an alt permanently sat at Booty Bay for this now. So far, we turned a 1-g investment into about 40g, with more items still in stock. This was quite good, but not as good as we'd hoped.
On the solo front, my bank alt there has turned ~2g of investments into well over 50g without really trying much. Cael server is full of very low level characters so competition is fierce in the kind of stuff I'm shifting. Profits havent been as great as I would have hoped on lots of what my characters can farm.
Again, personal networks are shaping up. I have met a newbie tailor who will probably help my enchanter level up when I supply cloth to help their tailoring.
I am playing my Warlock there most as that realm's Main. He is now mining/enchanting since hes high enough now that greens are a regular drop. Mining still supplies a regular income but its merchandise and auctioneering that builds my funds mostly.
At the higher end, my banker on Dath has flipped another 500g or so of stock into 1200 or so in gold. One more week should build my funds sufficent to get Crypt his epic flyer as soon as he hits 70. I do farm a bit on this realm but most income still comes from playing the auctions.
There are some truely unethical sellers out there. I got burnt a bit a few weeks ago buying rune thread off the AH. I got it confused with one of the tailor only blue level items... instead, its a vendor supplied item, that nearly every tailoring and general goods vendor has in unlimited quantity. I did manage to re-list it and get most of my money back over time.
On one of the servers, some devious person is trying to sell vendor bought water for upwards of 6g each, when a 5-stack costs only about 20 copper. I got a small level of satisfaction by listing a bunch of single items at just under a g each.... and all of them were bought out by the "evil seller"to protect his inflated prices!
Market PvP... truely more ruthless than any BG!