Decent concept...
However I am not positive it will work as they will have a record of what toon they handed gold to, and if yours is not on the list it will likely crash... unless they have some form of customer satisfaction policy (like going to McDonald's and swearing your food was wrong, but you never bought any sometimes nets cheapskates free food) but I would not bank on it.
There is also the sheer number of realms, and not all gold sellers offer any amount of gold on all servers instantly... if your realm/server has had no orders in 2 weeks they will know you are 100% full of crap...
Another important note... was talking to a RL friend that does sell gold via a website...
everyone pay attention here...
Last week a guy PayPal scammed him. Sent a fake PayPal screencap, you know the scam, we have it here on the site...
So, he got pissed. DO NOT PISS OFF A GOLDSELLER.
He sent the guy a free 100g in order to "make things right for the inconvenience"...
He decided to sac a gold transfer account... opened a help request... and reported the guy as having bought 100 gold from him. Even gave the GM the exact time and the location, and offered screenshots of the guy accepting the gold, and the PayPal statement listing what toon name he wanted the gold transferred to, photo shopped for accuracy of course.
Guy with his shiny, well scammed 100g.... permabanned. Sure his gold transfer account was banned too, but he knew it would happen, and decided to sac it anyway... it is HARDLY his only account, but I am betting it was the scammer's only account.
When you piss off a goldseller, and you accept gold from them... they have a toon's name. Even if you delete the toon right away it is still in Blizz's system as to what account the toon was created on, and when...
If a few more GoldSellers get savvy this way and it's a world of hurt.
One more thing...
Don't ask for rep. It looks petty.