I have worked closely with the management teams of some large celebrities. Almost all of them get anywhere from a handful to dozens of fake accounts created EVE

I have worked closely with the management teams of some large celebrities. Almost all of them get anywhere from a handful to dozens of fake accounts created EVERY DAY, mostly by trolls and people who want to harrass others. Some of them are very convincing and "leak" false information, bully young fans who believe they are real, and so on. A small handful of them try to monetize by posting spam links, but it's really rare. The vast majority are just trying to get attention or have fun at someone else's expense. This may seem like a non-issue, but when you're a high-profile person trying to protect a reputation, it's a real headache. And when you're a fan thinking you're interacting with a celebrity, and they turn out to be a fake, it greatly reduces your trust in the platform. Now, we could argue that we shouldn't really care about the concerns of celebrities, and that fan/celebrity interactions aren't what Twitter is for. But it's clear that they drive a lot of the traffic there, and Twitter encourages it. The verification system is one tool for making this experience better.