LFTR costs so much up front and if it does fail which is why it isn't utilized, which sucks because it's massively more efficient, cheaper to fuel, and like 1/10th the size. So over time it's ultimately cheaper than current gen reactors. Even with the failure cost replacement, there's no fallout because of its walkaway design, so yeah it's a LOT cheaper than a normal reactor failing.

Also it's the only reactor design so far that could work in space like on the moon or Mars.