Generally I have been trying to sell greens for half the GTN price, blues and yellows for 75% and purples for full GTN price. Most of the time the greens come back to me, which I then vendor. I would say out of the 50 max items you can post I generally get back 30-40 items to vendor.
For cyber the GTN price is absurdly low, I think the GTN price for mod 10s (lvl 29 I think) was like 400 credits, which I then put on for 200, and then got them all back. Generally I am just making stuff to level my cyber to my level and then max out my yellow gear. Based on the market conditions I think I am going to have to just start updating my gear every two levels with cyber so that I do not have left overs that I have to vendor (no I am not RE stuff because I dont want blue cyber gear sub level 50, and I took slicing instead of underworld trading, so I cant get the mats for the blue gear)
