In upselling, plausible arguments and, in particular, product demonstrations should be used to suggest to the customer the advantages of the higher product or service category, for example, greater benefits, convenience, etc.
From the seller's point of view, there is a risk that upselling will make the buyer lose interest in buying the product, i.e. that he will buy neither the more expensive product nor the product he had originally considered. Too extreme up-selling can also be perceived by the customer as pushy or even unappealing.