I'm sorry, Bill, but I have to disagree with you. It is an amateur approach, IMHO. Let's talk for a moment about the files in general: There are many manufactures who make files. But what would make a file one of a kind? I think, first of all, good quality steel! Hmm...a good quality, what the heck is this? Well, tools are generally made of 'tools' steel, it is not the same type of steel as for everything else. It is a special mix of cast iron and carbon which makes the steel 'cut' another steel. If you add more carbon to the mix, the tool will become brittle like glass, if you add less carbon, it will be soft and pliable. So... reputable companies know the proper proportions of a mix and keep in secrets for many years, which makes their tooling steel one of a kind. The good quality steel will last much longer and wear slow as apposite to cheap steel.
Let's discuss an average file set, they are darn cheap! Why? The answer is - they are made from very basic steel, not tooling steel. Often time not even hardened. Reputable companies will always put the steel grade on their tools. I don't think the small companies can afford to buy good material (it cost a lot of money), they buy cheap and sell cheap. Also, they are not using precision machines, equipment to make their tools. Why? For the same reason, they cannot afford good types of machinery - they are simply expensive to them. Therefore you have quality versus the cost.
I am using needle files which are 50 years old, they made in swiss by Grobbet- Valllorbe company. They still work as the one I recently bought (different size and shape). They will beat in performance and quality all of the cheap set. But the real deal will come when you answer yourself the question: How much I will spend on cheap files set in 50 years? I guarantee you, the good quality single set will be much cheaper than all money you spent on cheap sets.
My father, a very wise and sapient man, always told me: Son (he was talking to me) - I am not that wealthy enough to buy cheap...
But the choice is always yours, the one who has to open the wallet.