I’m used to traveling the same distance for around £40 regardless of the time I book (shinkansen). I guess it’s too bad I can’t save money on booking in advanc

I’m used to traveling the same distance for around £40 regardless of the time I book (shinkansen). I guess it’s too bad I can’t save money on booking in advance, but on the other hand, I can easily jump on the train at any point of the day without sticker shock.