Marketing is not about selling it is about creating a problem and providing the solution for the same.
Does not make any difference that your product is valuable as in we should be able to sell comb to a bald person.
we can first provide him good discounted hair transplant and then we can give him comb or we can give him comb with wig
the most common sales question "sell me this pen"
answer is
what pen are you using?
what is the wholesale price?
how is the demand?
are you getting something free with it, like pencil or rubber or scale etc?
what is the retail price?
how many color options are there?
And many more following questions help you to crack the deal

that's it