Is this the most profitable CPA funnel?

1. Select CPA offer like email submit
2. Setup landing page to capture email for autoresponder
3. Research keywords/audience
4. Send traffic to landing page
5. People optin
6. Send your CPA offer via autoresponder multiple times for 1 week

I saw a lot of people just sent traffic to landing page without capturing their email and if they don't convert on the CPA offer, it is just a waste.

I think i should rephrase this.

Which methods below is the correct way to earn from CPA?

Method 1:
Traffic -> Landing Page -> CPA Offer

or

Method 2:
Traffic -> Squeeze Page -> Email CPA Offer

No one can tell you in advance, it all comes down to variables such as your traffic, your targeting, your bidding price and what you get out of it.

Ideally you'll focussing on your ROI and let your ROI do the talking. You need to split test to find your ROI for both variations.