Just to share how this is working out for me personally: In 2017, I'll have made about $200/month average by selling tradelines to the old TL co. Two months of the year I made no sales; the rest of the months, I made from 1-4 sales per month.
Sales are on these two cards:
Discover card, 7 years old, 16k credit line
Barclays card, 9 years old, 23k credit line
Also, the weird security flags with Discover seem to have died down for me. Now, when I go to add an AU online, they're added on the spot, no "Please call us" messages or delays in the adds. Hope this lasts...
Thanks, ARS.