"The workers earn $150-$300 U.S. Dollars per month." Personally, I see opportunity for makers in more developed nations shrinking, because the high cost of living leads to a necessarily high cost per instrument, if one is to survive financially (in other words, the market just keeps on getting smaller and smaller for said maker). Certainly, in time and as the standard of living in China becomes elevated, the cost of living will drive up wages as well (it is already happening, in fact, and at a rather astonishing rate), but the divide remains rather large. True, as one man says the sound is not quite there yet; however it is on the rise. There is opportunity for these people in China, really good opportunity and the ability to capitalize on a unique point in time. As for me, I only look on making as an opportunity to supplement my income as I grow older. Make no mistake, I am driven by the passion and intend to make to the very best of my ability, but I am not driven by the potential for profit (and as I have never cared about money anyway, it suits me just fine).
I think the only way a person can really assure a long-standing career is to get into service work and sales (rentals included), as this is always a local function (i.e., something which cannot be jobbed out to some remote locale such as China).