Earlier quoted context omitted.
It reduces the size of the market for related goods, such as record sales, clothing, TV subscriptions, etc. by alienating poorer consumers. It hurts the brand, basically.
As I see it, I disagree that it alienates poorer consumers. Perhaps you were thinking along this line: that it discourages venues from offering coupon clipping discounts. It won't though: a venue has a fixed number of seats available, and will attempt to maximise its profit for this available volume of seats. If they're going to have leftovers, they'll find ways to discount out what's left. Scalping works against a v…
I'm suggesting fans will be turned off of performers / entertainers / sports teams / etc. by the perception that they (the performers) are overcharging for their performance, and that will hurt the longevity of the brand, and the sales performance of related products.
Similarly, if you drive out youth and cater for wealthier older people in the interests of maximizing short-term revenue, you endanger brand engagement 10 or 20 years down the line - this is particularly important for sports clubs.