Most parked pages make very little from search engine traffic. Very few were listed anyways. A couple domain parking solutions were trying to get around this

Most parked pages make very little from search engine traffic. Very few were listed anyways. A couple domain parking solutions were trying to get around this but adding content hurts conversion rates on ads. The better names still get type in traffic and straight ads convert better on that. I don't think search results were ever the driving source of traffic. A lot of places experimented, none really blew it away, so I can't imagine panda had much impact on the bottom line of any major players.