There are many people who just expect freemium to solve all their problems. Freemium needs to be carefully applied, and needs to make sure to be aligned with evaluation needs of potential paying users. Most times startups do not work on the details to make it happen.
30-day evaluations are really helpful when an urgency exists to use a product - in my experience for lots of business sales. But now-days I often get distracted with some project and am not really able to evaluate the product the first time around.
I look at freemium as an evaluation license for as long as you are not doing anything serious with the product. Ofcourse, you need to define the terms of the freemium part. Companies like Heroku do a great job with it.
