let’s take a step back here. Turkey is not doing all of this just to get a few bucks.
Maybe Turkey is trying to increase its leverage over Serbia and make them an important ally. In this way, both Kosovo and Bosnia will be indirectly secured. Let’s not forget that the Serbs served the Ottomans many times against the Christian.
also, I think it would be wise for Turkey to have Serbia on its side in a potential conflict against Greece.
Let me give you example:
Germany did applied the same approach with russia.
Idea was make Huge business with russia and in few years Business will push russia and make it depended.
Reality and it is FACT now in present it happened that russian spies infiltrated German business circles and bribed key people to for interests of russia and by that russia made Germany More corrupted
So Turkiye now apply the same Idea:
"Maybe Turkey is trying to increase its leverage over Serbia and make them an important ally"
No Turkiye will be tricked and all gain from this agreements in future when serbia become strong they will use all this platforms to attack ex territories