I've heard this too, and yeah the sound isn't the greatest. But where are you going to find 70's recordings of set rarities like "Surf's Up", "Disney Girls", "Don't Go Near The Water" and "Looking at Tomorrow"? I think
The philosopher Michel Foucault wrote in praise of curiosity, calling for "a readiness to find strange and singular what surrounds us; a certain relentlessness to break up our familiarities...; a fervor to grasp what is happening and what passes; a casualness in regard to the traditional hierarchies of the important and the essential."