Why do certain stores, for example an antique store selling masterpieces, charge an admission price?

Question

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The text indicates that certain stores charge an admission price to ensure that individuals permitted to enter can actually afford the products sold there. In these stores, it is also appropriate for customers to dress well, in order to not look "suspect." It may be True that the admission price provides some revenue, but in these types of shops, the admission price is a trivial source of revenue.

Why Do Certain Stores, for Example an Antique Store Selling