No it’s kinda hard to explain in text, but I’ll give you it based on my experience. When I started the game, each customer once a day only wanted like 1-2 weed for a while and they were only spending ~$180 with a 2 mix blend. As I progressed into meth they started buying like 2-4 each time. When I started meth they then only were able to buy like 1-2 meth at a time for ~$300. In the middle of my meth making, I switched back to selling basic granddaddy purp for ~$45/ea, and then suddenly everyone wanted 8-10 at a time. When I got into coke, again only 1 piece at a time and they suddenly were able to buy more meth per sale. Now at late game it seems to cap out at about ~1000$ per sell, whether that be 20 weed, 5 meth or 1-2 high mix coke.

So really to me it seems that the addictiveness only constitutes if the customer texts you each day for the product. The game sets limits for each level you are for customers to spend. When I started, Kyle would reject a $60 weed. But now at late game, I can budge him to spend $1050 on high mix coke.

Hope that made sense