Because that's not in our interest long term. If we charge upfront a large amount (and inevitable disincentivize ourselves from providing great support and upgrade to them thereafter -- which are crucial since it's an "extremely difficult" business), we will get negative word of mouth that will not be great for our sales and marketing.
Our conversion rate for http://www.zuupy.com is around 4%. Out of that 4%, 10% will eventually upgrade to a paid plan, which costs minimum $29.95/mo. So you can say that our conversion rate is 4% or 0.4%, depending what you mean by "conversion".
In general, more features are better. What is needed is user interface that organizes the assortment of features in an intuitive and user-friendly way.