By doing so, the company makes huge profits. It buys in large quantities and keeps the cost low which gives them the option to charge a large markup and expand the profit to greater numbers. They make more in this way than they would if they were to sell the products by any third-party brand.
Keeping it simple
Try to avoid electronics(for the time being)
Look at the alternative
Just because the item is on the top of your search list does not mean it is the best and most affordable. Scan all the features, go through the reviews and compare the items and their worth before buying the product.
Screenshot of Grammarly score: