same problem for me. maybe we can create a fund for a plugin for this with who needs this.
A plugin with this features would be great 
Ability to add ad codes between topics including while browsing topics under a category ( javascript, html, iframe etc )
Ability to add codes in posts.
Ability to add codes after posts.
Ability to add codes above topics.
Ability to add codes above suggested topic list.
marketplace plugin advertising
For funding, i can pay 50 USD ( 1 USD= 7,5 TRY 
) , if someone wants to join can type here.