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The voting system is not at fault here. It's the community. The bigger the website gets (and the more attention it draws) more people go towards it. Reddit has a lot of 13/14 year old kids who only "upvote stupid pictures" . The secret to Reddit is finding the correct subreddits and contribute to them.
The voting system is in a sense at fault. Examine the algorithm: 
. In the time you can read a reasonably long article worthy of an upvote, you could rate at least 25 images. Because of the nature of the time fall off inherent to the algorithm, human's natural inclination to keep hitting the dopamine button and that you can only give one upvote rather than rate content out of 10 or 100, pictures will always dominate over words as content.