In fact, a not bad budget is allocated for football in Turkey, the money paid to the players is not very small. But in general, foreign players are more preferred. Successful Turkish footballers want to play for European teams (: We can see that there has been a decline in Turkish football in recent years. For this situation to change, more Turkish football players need to be trained 
I want to add, Turkish football needs to be much more popularised as well because if it doesn't generate enough revenue, the money is not going to be good no matter what. Obviously, the players will have to prove themselves that they are also capable of doing great things. And the players are obviously going to be interested in European football because that's where the money and fame lie.
The Turkish league is indeed not as famous as Europe's top 4 leagues, not only from the aspect of its fans, but many discarded players from Europe's top leagues are also reluctant to take part in the Turkish league, so this also affects the absence of big sponsors that overshadow the club for now, even though as we know when Besiktas and Galatasaray played in the UCL many star players wanted to join the Turkish giants, moreover the Turkish club also did not give many surprises in European competition so it was not much favored by football fans.
