When I first started, I wanted to get on the band-wagon of crafting the highest level stuff possible, and for about two weeks I kept up with it before I saw the short-sightedness of it.
With everyone powering through everything as fast as they can, and money not being an obstacle for the most part, most people don't bother with anyone they don't directly interact with, and those that do, consider those people a bother.
While for the most part I sell only dyes and repair items (easy level up synths, and a good residue of items I am working on), I don't think many people notice that the reason a lot of synths have a high level component so that you can make them at a higher level, and still sell low level items. You get your precious skill, and you do something for the community.
Unfortunately other than lacking interaction in the world, this game also lacks interaction with the gaming community. I mean seriously, I can go a week without actually talking to anyone other than being yelled at for mining at a grade 4 location at 18. And I know I am not the exception. I am hoping it is just the lack of in-game interaction missing, and that people will actually interact with people when NPCs interact with them... but, yeah, that's hopeful thinking at it's best.
Low level gear is actually really nice to craft, and has helped me stay up on my cash when I want to splurge and get some new gear. I like the fact that at my level I am crafting for ~90% of the people playing. Now that I can have ~30 items for sale at any given point in time, it makes it easier to run through a series of different items.
Switching to gear only sales for ~0-10 gear, I sell each item for around 5k. Assuming both NPCs are setup for sell, that's an easy 100k in a day or two. And for rank 10-20 gear sells for ~10k each, giving me 200k, I am making about as much as a single rank 30-50 item goes for. And while I am not high enough for making most rank 30-50 items, the 1 or two items I do run through sell so infrequently (I get rid of about 1 a week), that I don't even worry about it. The high level ingredients sell far better than the actual finished products (thank you greedy crafters:).
So, yeah, you are right, there is a market there, and there are some of us crafters (it's like the silent oil crafters from 11) have already picked up on it, and are making a killing without much competition, and we still can't keep all the items available.