How. Many. Times.
Thorpe decide when to open the ride.
Thorpe decide who goes on the ride.
Thorpe decide when the ride is acceptable to open.
Thorpe decide what advertising they put out there in relation to ride opening days.
@Coaster Jamie - understand this. You cannot enter the park and have an expectation that you deserve to ride this attraction, at any given time (prior to full guest opening). It isn't open. It isn't advertised as open. As such, it isn't a publicly available attraction
Thorpe do NOT need to explain why they have allowed certain people on the ride. They don't need to explain why they chose said people. They don't have to explain ANYTHING to you, or others.
Its their park. Their ride. Their investment.
You will ride it, as and when it opens. Accept it, and move on. As someone said above, if you were chosen on park to ride in advance of opening, you wouldn't turn down the chance, so please, stop moaning. It's boring.