They are thousands of out of stock products. Should You sell them?

Just got my approval for amazon pro seller, and got approved for a couple of distributors.

One of them has thousands of products that are easy to ship and can sell for 50% profit margin. but as I was checking the UPC most of those products NO ONE is selling on amazon.

but they are thousands of them and to get the wholesale price I need to buy each product in lot. (can’t afford more than 1 lot for now)

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so, is this a good idea to fill the gap in amazon and start selling all those products that are out of stock?

or should I keep looking for a “winner” product?