This post raises some important questions and has great links to places where other similar questions can be raised and discussed.<p>However I disagree with one thing: having a single price point is the single most expensive mistake you will ever make in your company. Where you make the mistake is in assuming that what you think is good for you (simplicity of single price point) is also good for your users. Don't do this - validate the assumption. For what it's worth, many others did and they found that having three distinct choices is optimal - less than that and you are leaving money on the table, more than that and you confuse people.