If you are at 30%, you are also meeting one of the most common recommendations in personal finance (regardless of whether that recommendation is _good_ or not).
It seems obvious to me that recommendations of either moving or finding additional housemates both can have significant short and long term negative impacts on financial stability, emotional, and physical health (I didn't bother looking for a source for this because this is hacker news not a dissertation).
1. https://www.earnest.com/blog/rent-and-the-30-percent-rule/ which cites http://www.jchs.harvard.edu/sites/jchs.harvard.edu/files/jch...