>So a pretty narrow demographic for the feature though...

If you're only going to take one person's usage then, yeah, I guess it's pretty narrow. How about another example for from the same person. As a video editor I'm constantly having to find "hip/trendy/cool" music for video edits. These clients typically like music that I do not normally listen to, but I know it's something they would like when I hear it. I'll let it live in My Shazams until one day I need to find something. I've impressed more than one client with the ability to pull out a "fresh" song for them. Clients appreciate that sort of thing.