I am not disputing the efficacy of debt collection agencies at recovering money, in the same way as I would not dispute the destructive power of a bomb.
You just disputed the idea that a relationship with a collections agency would deter future debt collectors. I responded to that. I'm not arguing about any other problems you might have with them.
I'm sorry, I thought that was what you were arguing when you said:
"The delinquency letter you send out to deadbeat clients that says you work with XXX debt collection agency to recover fees is likely to get a better response rate than the one that says you'll "pursue all options"."