Be sure to slide the "Relationship bar" near the top of the page all the way to the right. Most of my leaf matches are on 5-8 cousins. Most all of my matches have been for ancestor lines that arrived in America before 1750.
If you haven't researched and documented (not just copied) your tree back 6+ generations, you may not get many matches. The majority of mine have been 6th and 7th great grandfathers.