Darian Shirazi, CEO of Radius, gave a presentation on the importance of paid acquisition for SaaS companies and how to optimize marketing efforts. He discussed key metrics like CAC (cost of acquiring a customer) and LTV (lifetime value of a customer) and how to use experiments to improve these. Darian also provided recommendations on tools to help with landing pages, analytics, remarketing and more. For companies where CAC is still greater than LTV after optimizing, he suggested checking for issues like targeting the wrong markets or problems with the product or sales team.