yeah 50k is about right for grey market or trade.i tried one on and it was beautiful.Unfortunately out of my price bracket for now.i had a 116528 for a while and even with that i didnt feel right having something worth so much on my wrist.I am stainless guy for now anyways.If i became a millionaire id prob have yello and white gold and platinum daytonas.
Other than the Deepsea Rolex's are too small. Your right about holding value but I've bought almost every swiss watch off a watch forum or at a 30% plus discount so never lost money on Rolex, Breitling's, Omega's, Panerai etc.
I just picked up a 45.5 Omega Planet Ocean and the new movement is amazing.