Under Cassini, the last thing that you want to do is get as many varied keywords into your listings as possible. Even if eBay doesn't directly penalize the practice, having your listings show up in response to every last search regardless of outcome is no longer a good thing. Just imagine this scenario: You add the keyword "iPhone" to listings for Android phones. Sure, your listings may be visible initially to anyone searching for an iPhone, but each time someone sees your listing and doesn't actually click through or make a purchase, it's going to hurt your impressions-to-transactions ratio, pushing you downward in rankings. The old hope that you might just change the mind of one in every thousand iPhone shoppers is now offset by the fact that those other 999 iPhone shoppers that didn't buy your Android phone after seeing your listing are actively hurting your search placement.