I'd say you get what you pay for in terms of TradeMe or Alibaba etc - low price flies are likely to be on no-brand hooks and assembled in a developing country.
So it depends on how you balance their lower cost versus durability/quality.
Most TradeMe sellers of low cost flies wouldn't have a clue about the hook brand used, I'd suggest. They are probably a 're-seller'. But if the TradeMe vendor is a recognised store with a physical fly fishing shop too, then you should expect the flies to be on quality hooks and I'd certainly ask them before purchasing.
I learned early on that moths soon get to feathers or natural furs left out in the open, so the flies on my vest patch are only ones with hooks straightened on a snag, or some other defect from a day on the river.
I'd stick with Pat Swift flies - cost more, but you'll definitely catch more fish, and they certainly last.