consider this, you can get a similar aged trainee for $20,000 and below who has skills better than this; this trainee of yours might take half a season or more to be as good. Also the skills it has now is very bad, you can't even play him in any game except in scrimmages unless you don't mind him hurting your team. this is general advice to players asking if it's worth training players like this.
try looking at the transfer list when you're free and search for young players _if_ you got no one to train at the moment. It's just abit over the halfway mark still many weeks till the season is over. You can get a cheap and young 1k-20k player with starting salary 3k-4k, then sell it later for more cash later if you get a nice draft pick.