When you have a brand new product that you now is a bestseller it would be nice to be able to weight the new product to make it visible for customers/visitors to see the product in automatic listings, like popular products.
This means that you do not need to make any manually listing of products.
The weight should also be set with an end date as it get some more real data from purchases.
This could be expanded to allow the popularity to configured using different parameters that can be weighted (quantity, new, margin, revenue, etc)