The demand is the demand. TM should just set the initial price higher. This will discourage scalpers because their return is lower and their risk is higher. Fans will get to see the concert if they are willing to pay. If they aren't, then the price is too high, or the tickets will go to other fans who value them more.

But many concertgoers buy their tickets early specifically to get the discount. The discount over later pricing is a valid marketing tactic. Airlines also raise seat prices closer to the day of the flight to encourage people to buy earlier ahead of time.

If Ticketmaster enjoys such market dominance, they become responsible to prevent widespread misuse of their own platform, lest they become negligent. They are owned by livenation which is a public company.