To be fair - the licensing catalog for each of the given music services varies pretty wildly, and you cannot expect to find almost any song on any provider. See: Spotify && [Jay-Z, Taylor Swift, Def Leppard, Tool, Beyonce, Garth Brooks], etc. Some of these artists have since released to Spotify but the concept is the same.

I agree, though. If PLEX or someone offered a subscription that gave me consistent interface to access all the streaming services, I'd probably pay a few hundred USD a year.