It can be frustrating when that happens. How is the formatting of your interest check? Sometimes how you organize your interest check can make a big difference since you are wanting to make it easily readable and understandable for people that are checking out your interest check. Sometime taking a little extra time in making sure all the needed information about your idea and the plot you have in mind are there and presented well can make a big difference. 

Sadly there are times ideas will flop but don't give up. Sometimes it just takes time to gather interest or sometimes it just depends on timing since not everyone is looking through the interest check all the time. Maybe the right group of people just haven't looked through your interest check yet.