From the outset I envisaged a Wikipedia type of site where everyone contributed for free and everything is given away for free. I am still committed to the Excelcalcs mission statement "ExcelCalcs will build the web's largest repository of solved problems using the world's most popular mathematical software tool (Excel) and make it available to the world for free." but what I find interesting about Mark's comment is that financial incentives and rewards might expand the number of users and the size and quality of the Repository. I don't think that it conflicts with the mission statement but it will only work if some users are willing to pay for particular calculations. In the first instance I would like to measure users response to see if there would be a demand for this type of service before I embark on developing the new features on the site.