Someone with 100K unids in his bank is more likely going to buy a unid cleaning script than someone who has 0.
If I had a farming script I would totally go and target the users of master farmer scripts.
"Hey you have thousands of seed you can't sell easily, what if I told you you can do something usefull and profitable with them?"
(works both ways btw)
My Shrooms script is labeled as a money making script.
I started targeting people buying herblore scripts by PMing users who posted on / bought herblore scripts saying that I have a script that could get them tons of herblore XP for free (the script in question collects secondary ingredients for herblore). Sales skyrocketed.
Shrooms isn't a herblore script yet I managed to get people from the herblore script market to buy it.
Edit: I'll be applying the same strategy in the opposite direction now that I have an AIO Herblore script in the store:
"Hey Shrooms users, you have a ton of Mort Myre fungus, why not consider making them into super energy potions with my AIO Herblore script?"
I have 3 scripts on the SDN.
It's based on personal experience and data tracking.
YOU are the one making statements based on personal beliefs and opinions, we can continue this debate when you are selling scripts like I do.