It is quite possible to find more expensive parts - and also much cheaper parts - than those we use in GamuT amplifiers.
It is just like cooking a meal. Simply buying expensive raw ingredients will not by themselves assure a fine meal. You are better off spending the money on a good cook and letting him decide.
Each part has to be selected to give the right quality for the job with an eye on the others. Spending too much on some of the parts will reduce the quality of the other parts you need. Chili, salt and garlic are fine, but must be used in the right dose depending on the menu.
You will not find any "specially made for Audio" parts in GamuT amplifiers. The parts we use have proven their worth in measurement amplifiers, high-speed switching, recording studios and other demanding fields of electronics.