Then there’s the problem of gifting/selling at cost. A friend was going to see Peter Murphy but then realised they’d be out of the country so gave the ticket to me - would have been a complete waste if it was only able to be used by them.
Similarly, I see a lot of events where people have bought an extra ticket for a spouse/friend who end up not being able to attend, so they sell it on at cost. Selling at face value due to circumstance really shouldn’t get caught up in a dragnet intended for SOBs.