There are a few places in my neighborhood here in Korea that make this. They only make a set number of loaves a day and have specific times that the bread comes out of the oven. For most of those times there's a line of people waiting 20-30 minutes before. They use scarcity as a promotional tool and it works really well.
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(Old Spike)
https://blog.kingarthurflour.com/2018/07/23/how-to-convert-a-bread-recipe-to-tangzhong/
(Short Spike)
There are a few places in my neighborhood here in Korea that make this. They only make a set number of loaves a day and have specific times that the bread comes out of the oven. For most of those times there's a line of people waiting 20-30 minutes before. They use scarcity as a promotional tool and it works really well.