CPA marketing is popular because it offers a low barrier to entry and seems attract to the newbie in affiliate marketing industry. You don't need to create a product or handle customer support. You promote offers and earn commissions when a specific action is completed. You can start with little investment and scale as you learn. You can target various niches and traffic sources, making it flexible. You earn based on performance, which allows for higher earnings with effective strategies. CPA marketing also provides opportunities for passive income. You track your results and optimize your campaigns. Its simplicity, low risk, and high potential make CPA marketing highly attractive.