Gencon has always had a no-refunds-after-the-refund-date-no-exceptions since forever, so nobody should be surprised some people still showed up sick. Before Covid, people were showing up sick, and they will continue to do so.
Maybe Gencon would benefit from partnering with or at least featuring some kind of trip or ticket insurance service. As much as I hate hate hate (hate hate...) Ticketmaster, buying their partnered ticket insurance for their events has gotten me my money back a couple times. You just need to THOROUGHLY read the fine print before buying and document everything.