Only because they keep it under wraps.
Why else are they still here? You don't hang around for 22 years making no money, showing no signs of leaving over some wacko plan to sell on.
If their goal was to grow the club and sell for a profit, the latest, absolute latest they should've sold up was when ground broke for the stadium. Once all the planning permission was sorted, once the finance was there, once the team were in the Champions League
That was the time to sell. But they stayed.
My opinion is they probably should have sold up during the Redknapp era
There doesn't appear to be any appetite for a sale and that's in direct conflict with the theory that's their masterplan