It would be nice if you could actually make money doing this. This is probably viable for jewellry as it stands, and blood plasma is a useful income source, but most other trade skill uses seem almost pointless except at high level.
Take making crystals, of the base materials, the rock and program disk are free (you have to find them), but many of the intermediate components are not only not free (which is as should be), but pretty damn expensive (which is no use at all).
It should be possible, even at low levels to make money out of crystal manufacture. It need not be much, but the cost of materials should aways be less than the standard price you'd sell to a terminal for. To this end, the cost of the intermediate disposable components (Symbol Library, Photon Particle Emitter and Crystal Reflection Pattern) should be much lower, maybe rising more steeply at higher QLs, but such that you can make some profit from making nano-crystals at low levels.