The actors are giving days of their lives to come to the cons and need to be compensated for it.

While I would find it creepy to pay for the time, I also see it as a sign of respect on fans’ part and as a way to make sure that the whole process is run safely and respectfully. But then, even in the old, old days of Trek conventions before paid availability, I felt uncomfortable to approach the actors and other panelists in the very limited time that they were out on the floor.

If not for the paid signings and photo ops, there would be fewer stars at these events. The old 80s and 90s cons had at most one or two actors and a producer, designer or writer. The price for admissions would be higher and there likely would be less availability for photos and autographs, and it would be poorly managed.

I’ve been to both political conventions and amateur sports events with photo ops and signings. In one case, the politician had a photographer who literally followed up with an ‘opportunity’ to buy the photo. (I’d rather use my own camera.) The sports star was mobbed and just took and signed pieces of paper and handed them back without interacting. Neither was a good experience for me.