It's all up to persons own wishes. I think Solmania uses plenty of hi-tech pedals, which can be expensive, but to build noise guitar our of cheap 2nd hand guitar and have few noise gadgets is really from 0 euro upwards - fully depending on persons own interest on investing.
Most of the silly priced toys used for noise are utterly irrelevant and unnecessary when compared to more important factors such as ideas and willingness to experiment and learn.