Are you 100% sure the "sell players at 200% value" trick still works?
Doesn't for me. I've got my own trick.
Offer the player out for 0% of the transfer fee. You'll get a few offers. Reject them all and then offer him out for face value or a bit more. You may not get offers straight away but there will definitely be more interest.
I've managed to sell Lovren, Lucas, Enrique and Mignolet using this technique at Liverpool. Lovren got me 18 mil over 12 months. Lucas was 10mil up front and 8mil over 12 months.
Hope that helps you mate.