I'm one of the non-professional lurkers who uses Pprune as the best insight bar none into commercial aviation. My interest is almost entirely personal - do you need justification for fascination? - but it doesn't fall into a neat categorisation of spotterhood, nerdy tech, history bufferhood, wannabeness or whatever. Aviation is fascinating, and Pprune is the good stuff.
I rarely comment, because there's rarely anything useful I can add, but I do learn a great deal. The issues covered in CHIRPS are always worth learning about, and I'd regret not having the view from seats 0A and 0H.
For what it's worth!
R