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.