It keeps her in the news cycle. And that's why Trump wants her out now. Have you seen DeSantis in the news since he dropped out? Nope.

I live in Florida, for my sins. I can't ever escape De Santis being in the news cycle.

It keeps her in the news cycle a little, but not much and not for long - and to little effect, I suspect. I think the same thing happens to her as happened to the other GOP also-rans once they stopped qualifying for debates and their candidacies became hopeless - they also disappeared from the news cycle while they were still running (poor Doug Burgum). She'll get some coverage around the SC primary, but very little in the weeks leading up to it.

That might be worth it - I was just pushing back on the idea that there's some value for her to stay in the race as an "emergency back-up candidate" to Trump. Again, unless he keels over very soon, that's just not going to happen for Haley. A convention of Trump delegates isn't going to pick Haley to replace a deceased Trump, whether she's still in the race or not.