Seaweed Sponge VS Normal Sponge

What is the difference between a $49.90 Seaweed Sponge and a $4.90 and below normal bath sponge? Seaweed Sponge is made of 100% Natural ingredients, as the label claim it is, feel like $49,90 and it is not a normal bath sponge but of Seaweed made. $4.90 and below bath sponge, feel like $4.90 and below and not of 100% Natural ingredients. Will I consider buying $49.90 Seaweed Sponge again? Yes, but I don’t mind the seaweed from the Dead Sea.