Software is like most other products or new services, there purpose is to provide a better more efficient and productive solution to a task or process. Estimating software is somewhat like that but there are some caveats.
There is a point when adding functionality that can start to get in the way of the primary purpose of any product. In other words there are side effects that diminish the value of the new enhancements.
There is a saying Don't fix it if it is not broken". And that is true of EasyEst.
The low price is because EasyEst has long since sold enough copies to pay for our development cost (and then some) so we are passing the saving on to all our NEW users.