Decisions are made faster as impatience builds.
When there’s only a few products to choose from (less than five), consumers are most likely to buy something.
Although they may not be returning customers until the next product comes out, you are sure to get more sales from some product versus getting some sales from many products (it is possible for products to make a lot of sales even if there are a lot of other choices).
When it comes out that the company plans to come out with a new product, they get tons of sales for the new product because the impatience of the consumers goes out of the roof. The new product becomes sold out in a matter of days.