Yes, no one is buying them on the gtn. You are absolutely correct. So there's certainly no reason for you or anyone you know to bother crafting these items to sell. Don't even bother. Nothing to see here, move along, move along.
I've seen this pop up in a couple of other threads on why don't people sell the mats instead of crafting and selling the item(s) that you make with the mats. To me, there's many different variables involved and no real RIGHT answer.
If I'm bored tonight, I should list the mats for exotech stims at the going per unit rate. Then go send companions and farm mats (acting as if I have zero mats to start), craft and sell exotech stims at the going per unit rate (and keep repeating) until the mats sell.
I have a suspicion that I can bring in more credits by gathering and crafting exotech stims in the same time it takes for the mats to sell. This is just based on my previous attempts at selling mats and them seeming to take forever to sell when my crafted items usually sold within 2 hours unless the market got a huge influx and I got undercut. But I've never timed it out before.
And isn't that kind of the point - Make as much credits in the shortest amount of time? But I know there's other variables like, how many times are you logging in and playing? It is definitely quicker to gather and list mats than it is to gather, craft, and list items and repeat.