Here's my reasoning:
A random person is scrolling through the wiki, and skips a lot of good pages to stick with things they're familiar with. A lot of good pages get no recognition or traffic this way, and die. However, if someone's randomly scrolling to find google translated pages as a joke they get a summary of the page in addition to the joke. They can then be like "Oh hey, this is actually kind of sick" and read the actual page.
This requires a direct change in languages, so it doesn't outright effect quality.