I've said before that if they really weigh their assets, their only asset that they can get market value for is the 1st pick, and they can actually get way above market value for it from the Celtics.
Okafor - can't even recoup a top 3 (maybe even top 8?) pick.
Noel - proving to be a one dimensional player, although probably more valuable than Okafor
Embiid - Will he ever be healthy? No one would take a chance on that.
Saric - Will he ever play in the NBA?
On top of that, no one in the NBA is going to give them fair value because they know the Sixers have to bring balance to their roster and start winning.
On the other side of things, the Celtics are sitting there (along with several other teams) probably willing to over a king's ransom for Simmons.