You gotta worry about products where you have to create the need. Ugh. You can do it, but it's hard and takes too long. In "What are you selling? Product, category or need?", Gopal Shenoy puts it this way,

A product sell is basically where a prospect walks in and says “Give me this product” - the customer knows that the product solves a well known problem.

PS. Gopal, congratulations on becoming a US citizen!