When purchasing Music (£0.99 each) how many plays would you say made the purchase 'worth it'?

I could be super wrong, but I don't think people who purchase music think about the value of those songs in that way anymore. Some people buy songs for the physical display of the package, the potentially higher quality playback, to avoid music from disappearing due to copyright or label issues, to support an artist since streaming is like fractions of a penny, for offline listening which isn't tied to a subscription feature, just for collections sake, for more emotional reasons - physically connecting with a song/album, to justify their recent impulse record player purchase, etc. Sometimes people just want to spend money (retail therapy), so they'll buy an album (digital or physical), never open it, and just keep streaming.