Ah Texas Jim,I knew you would catch that .
Let me rephrase and say ,much in the same disregarding wages and benefits .
Nothing different than that professional group of accountants you deal with . Meaning this ISA has taken upon themselves to be a governing body with regard to arborist type qualifications .As such they seem to want to dictate how business is done and have wide authority over all engaged in such businesses .
I suppose the organization of accountants might be some what the same .That being the case if so it's no different than the IBEW or ironworkers union or carpenters union .With of course the exception of wages and related matters .
So,like it or not if this organization requires an annual fee for certification if you belong to it,guess what .You are in a union of sorts, same with the accountants,doctors or dentist and attorneys who belong to so called professional organizations .
Don't ya just love it .