I fully agree with that one. What's amazing is how many people want a custom-designed web site fully loaded with all of the top features, including a shopping cart, and think that this can be done with a $100 budget
In the SEO business, we get a lot of calls from people who do not really want to pay you for services. They just want me a take a quick look and tell them what is wrong with their web site.
I also get calls from people who want a web site, but cannot describe what they want and cannot define a goal for the site, but they want you to give them a quote.
I would add a #8: Irrational Expectations. I do a reality check with people who think they will make thousands of dollars almost immediately with a new web site. If they don't get the point, I sometimes reject the business because I know that they will be a royal pain in the future. I do spend a lot of time stressing how difficult it is to build a successful web site. If they start out acting like a flake, they are likely to get a lot flakier in the future.
"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote." -- Benjamin Franklin