Creating funnels and finding out if your target market can afford you

When creating a funnel for my target market, I offer an entry -level product (~$30) to begin the commitment process and provide them guidance on which program I offer will be right for them. My question is how do I look at whether or not they can afford my ~$500 signature program from the pipeline of ~$30 entry-level?

I struggle with the balance of knowing I’m offering what they need vs. not attracting the right people to my signature program.