Most people who type in a domain are looking to buy the product the domain is about, not start a business of selling that product. However, if patient, eventually someone wanting to start that type business will click them just to see what's there. Others will do so to check out their competetions. Those two are you most likely to turn hits into sales of the domain itself. They are the minority though.
I do sometimes wish sedo would emphasize the domain for sale a little better though by highlighting the text with brighter color, a different font, or something more eye catching.