After years of playing HT, I must say that BB's training system is considerably better, and requires much more thought and planning. HT training is a joke IMO and is much more about getting deals off the waiver with secondary skills to match the one skill you are training.
However, the idea that selling your trainees to buy non-trained positions is a waste of money........I must disagree. That is just how you get rich and improve your squad, if you know what your doing. Trying to train only your own players, never selling or buying, it just doesnt seem lucrative to me. It certainly isnt in HT for sure.