Considering the topic had only ~50 veiws when the timer ran down, many of which were likely participants, and that Card Design War being posted at the same time took much of the limelight, I am willing to assume that lack of votes was due mainly to the topic not being posted.
I do not advocate people voting without considering their votes, but I will also not devalue the work people put into their submissions by abandoning the competition when it is likely it simply wasn't seen by many.