Selling Minecraft account with donor ranks on multiple servers.

I'm in the need of money to buy new games so i am wanting to sell my Minecraft account, i have many donor ranks on different servers. Some server are popular some are not. i do not know the entire list of how much they are but my Minecraft account is well worth over $500 but i need a quick response and only want to sell it for around $20 the current name is GBK_CombatCP but it is legible for a name change so if you don't like it when you buy it you can change the name that is already has.