Does anyone voluntarily buys them? I find them barely eatable food.

Sure. They even sell a sandwich version with cream: http://nibblesnscribbles.com/wp-content/uploads/2020/07/Lotu...

It's like eating a cinnamon-y, ginger-y oreo.

Yeah, put two of them in a cup of plain yogurt, let them sit for a short while and then stir them it - it's just perfect, not too sweet.