Who benefits from a PPC campaign?

I set up an ASIN listing for a product that is now also sold by other sellers using the same listing. If I initiate a sponsored product campaign (PPC, etc) do I get the benefit of the increased sales or do the other sellers also benefit from my campaign?

If a customer clicks on the ad, it means you have the buy box at the time. But this won’t stop the customer from selecting another seller afterwards.