Deano777 - Of course it has to do with supply and demand!
If the airlines are desperate to get new pilots, and there are not enough candidates available, they will offer better conditions to attract you.
However at this moment of this scenario seems pretty science fiction, it is nevertheless pretty logical train of thought!
Scenario, imagine there was jobs available for a pilots, and a company like RYR did not have enough pilots, they would most definitely pay your TR, and make sure you got better conditions then they need to offer today, where there so many pilots to choose from, that they can select only the best candidates, and then on top of that make them pay their own TR upfront!
That would NEVER happen, if there was lack of pilots to recruit!
So your logic deano777 is wrong - like any business - supply and demand is the master of the situation.