How exactly do fans prove their loyalty?
The main theme is giving band and labels tools to maintain and curate this relationship with the fanbase, and only then add ticketing on top of it. If you have a certain mass and sign multiple names from the same genre, you can leverage that data to "migrate" say Green Day fans to some new alternative/punk band and offer them discounts, under the assumption this could build strong preferences for that band in the future.
Instead of maximizing present ticket revenue and "burning" a band's current fanbase, you maximize career-wide earnings, fan number and impact. That's a kind of moat that's unbeatable.
Since the band and ticketing partner are not in the ad business and want to build long term, I expect that limited personal info to be much less likely abused than what the typical social network site does with even more sensitive data (yet, most people seem to agree trading those off to for free news of the Kardashians in their feed, so what do I know).
At the limit, any kind of price discrimination needs some type of information to execute, you can't subsidize completely anonymous fans because market forces will quickly close that loop and we are back to square 1. For example, a confidential association between my name and a record/stream purchase for the purpose of a substantial ticket discount in the future seems like a good compromise to me.
a ) scalpers will write algorithms to predict where the moats are before fans can get there
b ) it discourages new fans getting into a band
* Require names on tickets and verify them at the door. Then for fan checking see if they’ve been to shows in the same scene.