But startup acquisition news doesn't reach the vast, VAST majority of Yahoo's current, prospective, or desired users. Even pretending news like this reached a broad audience (while also pretending that audience doesn't have the same context you're attributing to HackerNews readers), acquisitions aren't just expensive - they're expensive with a significant risk of creating longterm internal pain of varying types and degrees for what, at best, could be a shortterm positive blip in general opinion.
How does this perceived misuse of funds and focus impact Yahoo employees? Their moral, productivity, and general satisfaction/enthusiasm?
Does it make it easier to attract great new hires who meet Mayer's hiring standards? (http://www.businessinsider.com/yahoo-employees-worry-that-ma...)
Brand marketing has real value, but this has got to be the least efficient way to do it.