I had the ability to view the vote count of answers awhile ago when my rep was lower, but the privillage suddenly stopped working so I looked at the chart and it now says you need a 750 rep, to view vote count. What happened? was it a bug that I could see them to begin with, or did someone decide you need a higher rep than originally decided?
The reputation required for the various privileges changes depending on whether a site is in private beta, public beta or it has launched as a full site.
A (somewhat outdated) comparison of the reputation requirements can be found here. The current reputation requirements are always available by clicking on your reputation score on your profile page.