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Nearly every day recently, I'll use up all my post and comment votes here on Meta. Why do we have the voting limit here?
Is there maybe a window nearby you right now? Look through that window.
There's some cool stuff out there.
Image copyright Stephanie Saries, offered under a CC BY-NC-ND 2.0 license; her Flickr page for the photo.
The point is to prevent users from vote-spamming the site to an extent.
That need to prevent spam exists on meta sites, as well as main sites.