AFAIK Ticketmaster doesn't decide, they are a service provider with a variety of options for their customers (the performers).

The customer picks an option (no resale, limited or not resale price, etc...) and Ticketmaster does it, taking a commission in the process. Maybe the commission changes depending on the formula, but really, they don't care about the details, they are getting the money no matter what.

The problem is not the situation about resale and all that, I would say that part is the customer fault, not Ticketmaster, they are the ones who picked a formula. The problem is that by being in a monopoly position, they can charge high fees, making the tickets more expensive. And by more expensive, I mean something like 30% more expensive, not 300% more expensive.

I don't think Ticketmaster offers a dutch auction, but I guess that if you are big enough and if that's what you want and if you can pay, they can deliver.