“If you are a serious DJ, you’re probably into vinyl. Sales of which have soared.”

I don’t think so:
http://homepages.cwi.nl/~steven/Talks/2012/01-13-steven-colour/albums1973-2010.jpg
http://homepages.cwi.nl/~steven/Talks/2012/01-13-steven-colour/singles1973-2010.jpg