Hi and welcome to the topic where you will be able to find all tips on how to potentially increase the value of your wow acct.
These are things i usually do with a account before i try to sell it.
First of all, i scam in someway about 2-7k gold, this depends on wheter the charater in the matter already have a epic flyer or not.
When you have scammed, i suggest that you look over the charaters rep, make sure you can get the head enchants for your chars class aswell as the Gladiator one from the SSO vendor (Revered, goes for all head enchants)
Max your gear, look over the gems to make sure everything is in top shape, even the pvp gear you might have or vice versa, this to increase the potential customers thus being able to raise the price slightley. You should also spend 1-1.5k gold on keeping a small stock of gems and enchanting mats, that way you can in your add say "Got tons of enchanting mats and gems worth a few k gold in the bank". Now that might be a cliché to most of you, but it acctualy work, i've sold some sick ammount of accounts and the account with that line tend to sell alot higher and alot faster.
Now, if you don't have epic flyer, go buy the skill with your scammed gold (make sure that you have a few 100 gold left at minimum), once this is done, consider getting the netherray mount from sha'tari skyguard, or even a netherdrake, a "special" mount increase the value.
Now you may be broke, and thinking what shall i do now ? Am i finished ? NO, not just yet. Take a quick check of your proffesions on the charater, and see if there is any decent recipe you could buy on ah with the little gold you still have, else scam abit more.
Last but not least, check if there is any charater that might be worth taking up just a few levels to 50-60, this gives the buyer a oppurtunity to think of the posibilitys of your account, thus making him think less price, and more of the fun parts.
There is alot of other ways to increase a accounts value but theese are simply the fastest ones, and best.
And before your flame, some of these might be common sense to you, but not to everyone.
Thanks for reading and i sure hope that this will help you