There we go with the 'obsession'!
Surely you could stick to the point. We were talking about training being profitable or not. It has nothing to do with day trading, it's a choice between training young kids into honest starters (say, like me and Trainerman are doing) or to forfeit training, save money and buy old guys already trained (say, like you have been doing Mike).
Now since we can all count, we can also estimate what costs are associated with training and we can compare the 2 strategies. So if you spend 2 million in training (which is a conservative number) for 2 trainees over 6 seasons, in order to be indifferent you need to sell the trainee (or add value to his skills) for at least that much. If you don't train you will have the 2 million cash (minus any salary you pay to players to fill roster spots instead of the trainees). It is debatable whether you can be indifferent in the current market environment, because as the prices for trained players have gone up so have the prices for trainees.
In the past it was most definitely more profitable cashing and buying than training.