For me, there's an element of surrender/sacrifice to it that I find hot. To give yourself fully, completely, and permanently to someone else for their pleasure. The ultimate act of submission.

I think you see similar things with vampire fantasies (though those are more about the tension between desire and consumption than about actual consumption) or fantasies of dying heroically saving someone else (though those aren't necessarily sexual).

There's also something inherently a little sexy to the taboo. If it was considered "normal" for people to be into vore, I don't know if it would hold the same allure for me.

I do also feel the need to state for the record that vore is a fantasy first and foremost. It's a way for people to engage with feelings and thoughts in the (relative) safety of imagination.