Market forces working through reputation generally do take care of verification fairly well in many countries - even more so in this era of free access to information. I find it ironic that in "socialist" (India, China) countries, these things primarily seem to run via free market forces with little or no licensing restrictions of who can practice a trade while in "free market" countries, there's endless red tape of who is allowed to carry out what trade.

Ultimately these systems are not about quality, they're about restricting free market in the labor pool to keep prices in a trade high.