Suggestive questions are questions with a built-in answer, ie the seller puts the desired answer in the mouth (talked into) the customer.
Don't you think that this considerable additional service is worth the slightly higher fee? (closed leading question)
What would you like as an aperitif? (open leading question)
Suggestive questions should not be asked too early or too often in the sales pitch. An intelligent interlocutor immediately recognizes the intention of the seller and defends himself. Towards the end of the conversation, such questions can be used successfully to help indecisive customers with their purchase decision (closing techniques) and to achieve additional sales (cross buying, cross selling).