The thing to remember about player development is that it is intrinsically linked to the ability of Nordeus to make money. I'm not talking about screwing us over or anything here. It just the way they have the game set up. Buy an 18 year old and you can keep him playing for 6 seasons with a reasonable amount of rest packs invested in him. Currently this player will cost what? 40 tokens? At for example 42 tokens, that's 7 per season. Nordeus knows this. And knowing this they can plan for their financial future. If this same player were to continue to play with the same level of rest pack investment season after season Nordeus would have to find a way to effectively double the cost in tokens of us being able to buy him. Would you want to pay 80 plus tokens for a player?
The way the system is set up at the moment means that we either buy a new player for a specific position every 4-5 seasons or we can always continue to pump rest packs into a player with ever decreasing effectiveness. Either way Nordeus keeps ticking over, making a profit and producing Top Eleven.
Change the life expectancy of players and the price in tokens or the cost in green packs would have to increase.
System works as it is.