Exactly. My primary experience with psytrance labels is this. Only a few labels have fulfilled their agreement with me, meaning releasing my music and at the same time paying me what we agreed on.
As I said here earlier, within a couple of weeks I will release a compilation with my own tunes released on labels who didn't pay.
Today's trivia:
I named my album "future uncertain" because I was sick of labels being unprofessional, I was not sure if I had the energy to continue making music where both labels and party organizers said one thing (payment) and gave another (no pay). I was uncertain I was gonna make psytrance in the future. After releasing that album, I stopped making psytrance.