The inevitable discussion about how we could just have an etiquette of not doing that, or a guideline for not doing that, or a new kind of flag button for that, or or or, will just serve to illustrate how much simpler a solution just not allowing comments on those posts is.
These posts aren't hurting you. My bet is most HN people actully think they're a benefit of HN --- early access to YC jobs! This is a fake controversy. Can we think about tolerating the YC job ads in terms of "least we can do for running HN"?