And how can we guarantee that people behind magic+ don't get any conflict of interest ?

Let say, for example, that i need a cab to move me from airport to the hotel with a bike to make the thing more complicated for a lambda traveler. How can I know in advance how much I will have to pay ? that the deal is decent ? that the guy will actually come ?

I understand that they target rich people but I imagine one does not simply want to pay 200% more than usually a helicopter ride...