Yahoo controls 8% of search traffic and costs $4bn. Google controls 64% of search traffic and costs $558bn. That's a 17-fold difference in the price for 1% of the traffic. Even more if you take US search traffic only (to exclude Yahoo Japan). Verizon can get rid of the costly parts of Yahoo (mostly its media business) and have its own small Google to make cash. That was $1.8bn per year in 2015, while Yahoo's overall…
Yahoo! (like Twitter, in my opinion) may only find a buyer in that sort of financial purchaser who doesn't mind looking bad resurrecting corpses. Unfortunately, those bidders are notorious low ballers.
[1] http://marketingland.com/yahoo-microsoft-rps-guarantee-42680