No opt-in page and VSL for low-ticket offers?

Hello everyone, after watching the "Overview, offers and funnels" video, I have the following question: Is it necessary to have an Opt-in page and a VSL in your sales funnel to acquire a customer when offering a low-ticket offer?

A client, offering a $20 per month training offer, wants to launch ads on YouTube, should these directly lead to his sales page without any intermediate steps?

Moreover, what is the smartest way to offer upsells to a new customer? Through email? A call? Or something else?

Thank you in advance for your valuable help 🙂

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