Earlier quoted context omitted.
Edit- Also a fun old quiz that helps beg the question, do you really need to add a fancy font over a system font? - http://www.ironicsans.com/helvarialquiz/
I fully support your point—many times there are free or system fonts that are at least as of high quality. That said I only missed MATTEL on that one. Helv has a few giveaways and refinements but most people don't care—though the differences Arial and other modified Helveticas do have arguably render the type less neutral.
The difference of course is we all know what to look for & were purposely looking for those differences.