While I don't generally listen to experimental music.. I do occasionally, and write it every once in a great while.. To me, it's something I appreciate, to 'cleanse my palette. It is also fun, to ignore all the music rules, and conditioning most of us have been infused with.. It is also an area, where a composer can create his own rules.. If they continue this path, they create their own grammar and syntax to use..
Part of it's appeal is it is different, and the conception someone breaks the rules. something some composers and some listener can appreciate or go out of their way to discover.
The first synthesizers, were collections of electronic circuits, used for scientific projects, LFO', VCO's, Sine waves, VCA's etc.. So some of the first electronic pieces, were more often done by engineers, a collection of sounds, and processes. Many of these men, were not musicians per say. (some were).. Commercial synths, MOOG, and ARP, put all these separate modules into a box, with a patching system to connect things.. Other than Walter/Wendy Carlos, (who made the first commercially successful record of synths playing Bach);. Electronic music was largely blips, and beeps.. very experimental.. weird, off-putting, and also 'enticing' to some.
Also experimental music can sound 'chaotic', because it ignores most harmonic, and music process our ears have become conditioned to appreciate. It's something some can appreciate as our world seems to become more chaotic.. Frank Zappa, had a wide variety of musical influences as a child and young man.. Some well known (in their circles) experimental composers, as well as classical and jazz. Although his first music was more rock.. He advanced towards more experimental and chaotic compositions, once he acquired one of the first Synclaviers (a synthesizer or even 'workstation').. It made first class, out of this world sounds.. As his music became more experimental (and to me chaotic) his audience changed.