I think the point you are missing is that training is not all about profit. Yes the profits that were previously available from selling trainees was nice, but to be frank I doubt the market will never be the same. The incresed amount of well trained players has brought prices down and I cannot see it changing.
Training however has become even more imortant imo. The reason for it is the really multi skilled players that are 'unique' are practically impossible to find and are extremely expensive. So training from with in is a great stratagy, and my team is a good example of that. I have seven players on my club that have been trained since day one, and are worth far more than the money I could have saved during that time, by using you stratagy.
The bottom line is that one of the best parts of BB is that there are alot of personalized choices including, how you build your team and your players. Whether training is a part of what you choose to do or not is really your choice and hopefully for you it works out. For others including me it is a stratagy that I would never employ, but that surely does not make it wrong.