The office of the New York State Attorney General said that since the first week of February it has received thousands of consumer complaints tied to the virus, on issues such as price gouging or fake medical treatments, but only 10 so far touching on ticketing matters. But experts say they expect an increase in formal complaints as more and more concerts are postponed.

For many fans online, one serious concern is whether companies jettisoned their refund policies when they saw the tidal wave of claims building.

Ticketmaster, which is owned by the concert giant Live Nation Entertainment, acknowledged that it had made changes to parts of its website once the coronavirus stalled the touring business last month, but that its underlying refund policy has not changed. That policy — which customers must click to accept when they buy tickets — says that refunds are processed automatically for cancellations, but that organizers of events may place “limitations” on refunds when it comes to postponed or rescheduled shows.

“In the past, with a routine volume of event interruptions, we and our event organizers have been able to consistently offer more flexibility with refunds for postponed and rescheduled events,” Ticketmaster said in a statement. “However, considering the currently unprecedented volume of affected events, we are focused on supporting organizers as they work to determine venue availability, new dates and refund policies, while rescheduling thousands of events in what continues to be an evolving situation.”

Sukhinder Singh Cassidy, the president of StubHub, said that the company had long issued refunds to ticket buyers before recovering charges from sellers, but that the huge number of cancellations has made that almost impossible.

“The complications that arise, and just the magnitude of this timing challenge, is frankly challenging for any intermediary in the normal course of practice,” Ms. Singh Cassidy said in an interview, “when practically speaking, that normal course no longer exists.”