Hey there
I've found a very useful and working way to prove that you have an epic character to sell to anyone (while, of course, you don't)
What you will need:
(1) An armory of any good character. I suggest looking at This thread on how getting epic characters, as that guy have some good ideas about it.
(2) An private funserver which you level instantly to 70 and have item shop. Or you can make a private server of your own to make it look even more real (details later). I'll not give link to any to not support anyone and you can easily find those around the net.
(3) Patience and some work
Ok, first, find any good character like explained in (1). Any class or race will do, or if you have preferences (like dual warglaive female nightelf rogues) you can be more specific. What matters is that the char is EPIC
Then, you go to the private server and create an EXACT copy of the character. Same Class, race and gender. Obviously, the appearance aren't necessary as the armory doesn't specify this, but the name and guild name must me the same.
With the character created, go kill something or do some quest to get a lot of gold and level to 70 (or 80 depending on when you're doing this, because probably some servers will upgrade to wrath). Then, go to the item shop and buy THE SAME items that the character is using on armory.
That made, equip the character, go to the options menu, interface, and show your name/guildname (this is used to "prove" that the char is the same from the armory)
From that is simple, take some random screenshots, so you can send to the buyer. You can even take a screenshot of the character saying something like "I'm <your name> and this is the character I'm talking about", so there will be no doubt it's you.
Optional step: If you can create your own private server, you can even make it's name the same of the original character's realm, so you can take screenshots of the character selection screen, which can be a good bonus if you create more level 70 characters.
I hope this method helps your scamming
:wave::wave: