ZIPs vs Emails

Personally I've not been having very good luck with emial submits, and I'm getting lots of views....just few converts. How are ZIPs usually? Anyone have a similar situation and switched for the better?

A short lesson on conversion rates in my experience and study.

1 - 20% conversions are optimum, if your close to the number your doing marvel-os-ly well.
2- You cant say your offers are not convertion until you have sent a shit load of traffic to that offer.
3- You can increase conversion by splitting traffic btw two similar offers. Thereby finding out which one converts more .
4- You can increase conversions using comments, custom landing page and a host of dirty little tricks you can only learn by digging for gold within wwwwwww.blackhatworld.commmm