What kinds of ads would appeal to people searching on Twitter? I've never done a Twitter search where a paid ad would have made much sense.
You've never searched for a company or a brand to see what people were saying about them? (Competitors or damage control PR ads) Or for a conference hashtag? (Local eateries and hotspots) Etc.
I have. I've never searched and thought that paid results might give me something better than the stream.
I've never searched Google and thought the paid results might give me something than the real results either, but that doesn't stop those ads from making money.