From what I can tell, this function does not return the value of what was sold. Is this correct?
That should come with the next PLAYER_MONEY event
https://warcraft.wiki.gg/wiki/PLAYER_MONEY
Did you end up figuring out what it returns? I have a little home grown addon that sells junk for me but now that there is a sell all junk button it seemed like an easy move to change it to sell those items using a natural function for it, but I really like being able to report back what I made after.