Same reason why people don't like jazz, classical, dub step, ect. People just don't like music because it's not their thing.

The thing about techno/trance is that it was over done so much a couple of years ago that most techno/trance became repetition and started to all sound the same to the general listener. Now that people have moved to dub step/house, people have forgotten how amazing techno/trance was and can be.

This is why I love Newgrounds. We have artist that loves and hasn't forgotten how amazing techno/trance is.

I'm not saying that this song is amazing, but it is unique and that's what I find fascinating about techno/trance.