I understand how examples can be very graphic and directly relate to the reader's problem, but unfortunately you do come across as preachy.
I'm not sure that a sales angle would fit in this picture, but I'll give you one anyway
To modify the behavior of your readers you must first reach a level of empathy with them. To give a small example:
"Drugs are bad. This is the mantra that everyone keeps pushing down your throat, again and again and again. What they always seem to forget is that drugs are also addictive. I know that you want an end to it and I can help get rid of your drugs problem. No preaching, no morals, only a practical solution. The cards are on the table face up. It's your life and you choose how to live it. I am only offering you an alternative. A way out."
Hope this helps.
Regards, George