What is your acceptable conversion rate for your squeeze pages? By that I mean, what percentage of the people you send to your squeeze page's email do you expect capture?
It really depends on what you are offering in exchange for peoples info. I'd say it can range from 5% to 60%, anything higher is absolutely marvelous. Avg i'd say around 25-40% is acceptable. I have since stopped forcing squeezes, i only offer them as supplemental tools on sales pages (but i'm a vendor), as an aff - I would still offer a click through (aff link of course), this will help your G ranking (outbounds), but only a little... Also depends on where/how your traffic gets to your pages. You can send 1000's of hits with .5 conversions if the traffic is not targetted, and 80% or more if it is bullseye. Feel free to post your LP/Squeeze perhaps we can help you dissect it. NC.
My only successful adwords landing page gets 65%+ CTR. From there 10% of those actually buy the product. I have used the same format on other product and got the same results (65%). But the people never actually bought the items. So if you're paying for those clicks.. I would suggest anything over 50% or you're wasting money.
If you aren't getting at least 33% you're doing something wrong. I know that sounds too high but think about it, these people are clicking on your link because they are interested and being taken to a page that offers them a free product just for putting in their name and email address. Sometimes it can be as simple as a bad headline, wrong text colors, too much text, too little text, optin form in the wrong location etc. You should always be split testing everything and tweaking it to the max, its a lot of work but its worth it.
Between 55%-60%, But it really depend, in some niche you can have better conversions with 40%, than with 60% in other niche, Test and try the whole system, that's the way.