I was a fan a lot of his music and musical ability so I was very sad to hear of his passing. It's a bit of nostalgia or remembering what his songs meant to me. He was also back on tour and making appearances (e.g., Grammys saying, like books and black lives, albums still matter). I know people who went to his recent concerts just weeks ago. So to go from that to "he's dead" was quite the shock and hard to take.
As to why there is so much interest in him on this forum, there are so many reasons. There has been much speculation here as to whether he was still an active JW. His sudden death brought those questions to the fore.
Then of course, there's the money. Did he or didn't he give it to the Watchtower? This was something that especially concerned me in the days after his death. I **really** hope he didn't leave them a dime. On one level, it's shocking that someone of his status wouldn't have a will. On another, who knows? Maybe Prince didn't have a will precisely because he thought Armageddon was happening any day now. I think this would be so perfect--just desserts for the Watchtower that for so long has counseled people not to plan for the future. In which case, it serves them right. On top of that, his philanthropy in life suggests to me he wouldn't give away all his money to an organization that does next to nothing to help anyone.
Also, for me it highlights the hypocrisy and double standards in this organization. My JW acquaintance called another performer "my idol" because I was happy about her recent engagement after an unsuccessful relationship. Um, what's idolatrous about that? That I can be happy for her even though her songs weren't about long skirts and religious magazines? Yet upon finding out that Prince was a JW (he claims not to have known before, even though I've known for years) has changed his avatar to Prince. Really!? How is that not idolatry? I'm just waiting for the perfect time to bring it up.
The Prince issue brings together everything the Watchtower claims to be but really isn't.
As to whether this will bring interest (studies or attendance increases), it remains to be seen. But what I have seen says nope. People still passing the carts by at the same rate. Ignored. No one cares. If you loved Prince, it was the music and who he was as a person that you loved, not his belief system.