If you can only justify a belief by appealing to the assumed superior knowledge of experts and specialists because you lack such expertise yourself, you're probably going to be wrong a lot less often when you appeal to authority than when you decide to disagree with them simply because experts are fallible.
That may well be true, depending on the quality of experts and specialists in your society (and assuming they aren't generally serving vested interests that could skew their views), but, epistemologically, you can't prove it without further appeals to authority. So it's experts all the way down!
