It makes no sense that you can spend 224 tokens on a player in order for them to learn there special ability only for there valuation to stay the same. In theory you could buy (at level 5) $70M with 224 tokens - so technically its costing you $70M to train a player to have a special ability. So why oh why is his valuation staying at say $8M? He should then be valued at around $40M which is silly money for a level 5 player BUT it would create a buzz if it were harder to obtain these players with special abilities. Like rare's, It would create players that everyone wants but not everyone can afford (like in real football) - Also if when new players are generated there was a couple of these 18yr olds with a special ability floating around that cost $40M it would do the same thing.
Of course Nordeus would have to alter the game so that special ability actually gave you an advantage - But anyway there is my idea and i think it would add something extra to a game that can get quite tedious on a day to day basis.