B2B business.
The other party like the concept but don’t like the design of the product.
(By Other party I mean Cafe owners mostly).
Everyone (cafe owner)has own unique preference and demand!!
How to solve this issue?

Owners like the concept but complain about the design.

If I modify design according to them the production cost will increase. Then I will not be able to provide them the product at suitable price. Then again they will not buy the product and start to complain about the selling cost

How to sort out this issue?