I encountered this same issue today. I've created an improvement request on the ideas website here: https://c.na9.visual.force.com/apex/ideaView?id=087E0000000CwOL&returnUrl=%2Fapex%2FideaList%3Fc%3D0....
Please upvote if you'd like to see this functionality added in Dashboard.
I have encountered this too. My situation is as follows;
I have one of my attribute field named “Asset Logged”. The field is numeric with coded values of 0 and 1 for Yes and No descriptions. We set the data up this way to be user friendly with Collector for our district staff.
The operations dashboard app is meant for our district managers to track their district's progress of completing logging all company assets. I understand the explanation Tif Pun gave. But does anyone know if there is a work around to show the count of ‘Yes’ and ‘No’?