There are two kinds of recomended.
One is the weekly offer which has sometimes good players.
19-21 y.o. , depending from the quality of your team.
The other one which compares your player with opponent's player
or recommend a younger player than the one you have.
This happening every 2-3 days and can be a good player or useless player or an old player or a player with high q but with crazy tokens.
Your trick can works in the 2nd case but not in the first.
There you still can get GKs all the season.