serryjw, one reason why people like ZFBot is that if you are planning to purchase a domain name to flip or you already have domain names for sale and you want to find potential end users then you can use ZFBot to very quickly find a list of potential end users.
For example, let's say you have a domain called BirdFeed.com and you want to find an end user to buy the domain. Go to ZFBot and type in 'BirdFeed' and hit the search button. You will then get a list of 'x' registered domains that contain 'birdfeed'.
Given you want to sell your domain to domain owners who have a domain 'related' to your BirdFeed.com, this initial list of domains and their owners are a good starting point of potential end users to contact. You will still need to do some filtering on the list and for some keywords you could have a list of 100's or 1,000's of
potential end users in a matter of seconds.
Hope that helps.