Price Check for 1 Def Pure~USD

So I'm thinking about quitting if the price is right, dont play much anyhow since ive been in college and to be honest i dont find runescape fun anymore.
anyhow this acc is well on its way to becoming a maxed 60 att pure. cmb level is 77. fully quested except for the elemental workshop quests. looking to see what this could fetch me in terms of USD. thanks for looking
the account also has about 40m worth of items which would be included.