It isn’t easy to come up with new hotselling products every now and then. It's as hard as creating a new and foreign color! At the same time, you just can't be selling the same old products in the Internet market for a long run and the reason is because the market is always looking for something big and new.
If you persist, the value of your outdated products will decrease and eventually, they won’t sell for you anymore.
Otherwise, you will be cracking your head for new ideas to create a product because without a product You will have nothing else to sell and your income stops there.
You don't want that to happen, do you?