I don't ever. And I look down on those who do.Really cared and just reading a wiki page don't compute for me. If I 'really cared' I would for sure play the game or watch a playthrough, I'd want to know and experience every story detail.
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If I really cared about a story, I'd just read a wiki page about it. Or find some short video summary. I can't imagine watching a playthrough just to get through the story. Especially of a game like Skyrim.
Reading a wiki page for me would just be for a game that I'm slightly interested in or intrigued by but don't really want to invest any time into.