This is an exceptional pilot, I have similar one (330mil SP). I did not think of selling it yet but if i would, i would not go lower than you.
I am sure that you will find the person that can afford such a pilot.
Of course anyone can find alternatives and cheaper ways to play the game but some prefer to have perfect skills and board any ship and use it at max performance.
So please, do not sell your toon for less than that half a tril