difference in stipend rates between regular foster care and therapeutic foster care

Where I am Therapeutic foster care's stipend is 3x's the regular foster care stipend and kids in regular care will not qualify for Therapeutic no matter what the situation, only private agencies get the higher rate. So, if a child can't be placed in regular foster care (no matter what their needs) they will qualify for the higher rate because it is through private agencies, but if someone in regular foster care agrees to take the child (again no matter what their needs) they will get the regular rate. Here, it doesn't seem to depend on the child's needs, just where they are placed; however, many (if not most) of the children in therapeutic care are there because they are hard to place due to behavior, medical, emotional, or psychological issues.