As a professional marketer,how would you plan a successfull marketing campaign to a product that you believe is useless and you would'nt buy or use?

Present a stragical marketing plan (with value addition,quality and affordable pricing structure to compete with your rival competitors product) using all necessary tools to positively advertise and market promote this product which should reach to every level of your targeted consumer.

I dont know the buying and selling properties well

make an experiment about the product and try it by yourself because you cannot make a marketing campaign if u dont know the value of that product to yourself and to the costumers.

This is completely simple, define the customer buying behaviour because what i can consider completely useless always can be found attractive to others.

 This can be done through demonstrating the product to a diverse customer groups and based on their reactions benefits of product can be revealed to use them as the theme of the campaign