Ticketmaster is in the news because they had trouble with sales for the upcoming Taylor Swift tour. I have trouble believing that they are worried about changing venues (I expect they chose the largest available in every case) or selling the shows out.
And the number of shows is a decision that is taking into account a lot of factors that aren't reaching as many fans as possible. That's fine, no artist owes their fans anything, but the goal rather obviously isn't to maximize attendance opportunities.
Taylor Swift is huge, a megastar. She has a fanbase in the millions. She doesn't want to tour endlessly as it is exhausting and impedes upon a family life and seeing friends. So... a big tour, but big venues.
Her fanbase is all ages, but probably veers towards teens and those in their twenties as she went mega-big after 1989 was released (in 2014).
The vast majority of the fanbase are younger, and therefore poorer (wealth is accumulated over time, and the cost of living crisis hits the young disproportionately).
Because the fanbase is so large, the minority with wealth could afford to purchase every ticket under a dutch auction and the vast majority of her fanbase wouldn't stand a chance.
Taylor Swift is famed for doing things for her fans, getting them in to gigs, visiting in hospital, sending messages to console... and basically having empathy and caring for them.
Can you even imagine the headlines on every front page as teens and twenty-year olds are priced out by older people who are wealthier... and the immense damage that would cause to a brand curated and sculpted over the past decade or more.
In this specific instance... Taylor Swift would consider the proposal in the article to be the worst possible thing she could do. It would still be flat-out rejected.
And the number of shows is a decision that is taking into account a lot of factors that aren't reaching as many fans as possible. That's fine, no artist owes their fans anything, but the goal rather obviously isn't to maximize attendance opportunities.