Ticketek ‘glitch’ appears to re-sell fan’s $659 ticket for Taylor Swift concert — “They said, ‘someone else has it, we don’t know who, we can’t check or track who has your ticket’”::A Taylor Swift fan believed her VIP ticket was ‘stolen’ from her account by Ticketek after an apparent system ‘glitch’.
I can’t speak for the arrangement between the artist and the venue, but generally the agency just makes money from the fees.