Yeah right. For 150k and more you can by a 30-33 year old guy with a salary of around 20k.
Whereas to train a youngster up to 20k salary would take 3-4 seasons.
Easiest recipe for winning: Sell all players and buy cheap old farts, as the choice is plentiful really. And then train game shape all season, oh and can also buy a trainer with career extension.
So you can either train a player for 4 seasons that would hold his skills for another 10 seasons, and benefit from the associated merchandising from having some roster consistency, or spend the 150k every couple of seasons to recycle through another old fart.
Of course, it mostly depends on how picky you are on side skills, too. If you just want X ID/IS/REB and don't care for instance if there's pitiful passing, inept handling and so forth, the veteran cycle is great. There's no need to bother training that type of inside donkey because there are other donkey lovers more than willing to do that and flooding the market constantly.