I've always been laughing a bit about the "no warranty" scare tactics by Iwata and other companies, trying to stop importing from markets where goods are less expensive.
The warranty only covers problems that aren't related to wear or inflicted damage. So the only thing it covers are if anything major suddenly breaks without explaination. Something like the welding of the cup or similar. In normal use I have never seen anything like that happen. Usually, the price difference between an airbrush sold in as an example, Hong Kong and an airbrush sold in Europe is larger than replacing nozzle, needle and packings a couple of times. I will keep on buying where the best price is to be found. Pay with credit card, and check descriptions carefully, and you will be almost as safe as buying locally.