There are times when visitors simply browse product pages and leave without buying anything. Even when they are ready to buy, in most cases they tend to forget where they saw that product.

A Wishlist plugin would be a great tool for such users. It can help them maintain a list of things that catch their eye on your store and then come back to finalize the purchase. In many cases, the users simply dump products on the wishlist and then wait for sales or discount coupons before purchasing them.