its an issue because I like to replace what I sold, without having to see which version(s) I still have up on gtn. I have every version of the implants and earpieces at the top end, in purple. In the case of implants, I have two of each (heck, you can wear two implants, why not buy two of them from me. If you like one enough to buy it, buy a second).
In short, I have over 80-100 combined on the gtn, easily. Including 6-8 of each "prefix" of both implants and earpieces. Its a hassle to read "someone has bought Cardio Relay..." then have to go to the gtn to see which is missing, to craft its replacement. If it said 'someone has bought Hawkeye Cardio Relay..." there is no hassle, no running to the gtn, no searching to see which sold. I just open up crew missions, and assign the task of making its replacement to an available (and skilled) companion.
Given the volume of stuff I have on gtn (all trainable/learnable orange gear, as well as implants and earpieces of purple quality, and color crystals, enhancements (4 types, 5 each), purple focus, shields, generators), it takes me 3 hours to put them all up. Its a hassle already. (but, 2 mil/day for sitting around doing nothing is worth it) To have more hassle on the mailing return of what sold, is pointless.