The negative is in the framing of the question itself.
You ask why she leads a high profile existence, and speculate that she could live a much lower profile and still be a successful pop star. You also suggest that choosing a 2 time Superbowl winner for a boyfriend was done to increase her profile, and that she could be dating a lower profile person.
Then you comment that you can’t imagine living such a high profile existence would be fun.
That right there is what most of us seem to be reacting to, the embedded assumption that there is something wrong with her lifestyle.
Maybe it’s just a misread on our part, but no matter how you caveat it, the nature of the question itself feels negative. And a big part of the current public atmosphere around Taylor right now is negative and judgmental and bizarrely conspiracist. People are losing their shit that she chooses to attend football games to support her boyfriend.
I think maybe that atmosphere is affecting how we are reading the question.
So to attempt to answer the question in a neutral manner, I would say there are a couple of factors.
First, she wants to write and share her music. That means a certain amount of self promotion to grow an audience.
Second, her writing is about her personal life and emotional experiences. This means her fans feel more linked to her as a person than to, say, Bob Dylan, who wrote emotional songs that weren’t about himself.
Third, her songs talk about common experiences, emotions, and themes that her generation are dealing with, so that creates a personal connection for the fans. The way Curt Cobain connected with his fans.
Fourth, sometimes fame snowballs outside the person’s control. Look at the fame around Tom Cruise and Katie Holmes when they were married, and how that attention focused on their daughter.
As for her choice in boyfriends, since she’s already a high profile celebrity, meeting other celebrities is a lot easier than for, say, me. And because she’s already inundated by fame, dating someone famous isn’t really a change that it would be for, say, me.