Is a Hope BB worth paying twice as much as XT for?
If that was the price difference, then yes. But you can get 4 XTs for the price of a Hope one and have change left over.
But there’s no right answer tbh… You’ll get a lot more life from 4 XTs than from one Hope, but obviously you’ll need to change them more often. With Hope you pay extra (and up front) for convenience basically. And pretty colours.
There’s a third way… Gusset’s EXT24 is a bit longer lived than an XT (though not as long lived as Hope) and has easily replaced bearings (so is also more servicable, should you choose, dead easy to clean out and regrease). So if the disposability of Shimano offends but the price of Hope is an issue, might be worth looking at. Also come in pretty colours 😉