I'm with you right up until you mention the Amish. Check our fruit against theirs. We loose.
I can point out the scriptures justifying paying a pastor better than most. Yet the practice still, as done, inevitably results in great harm.
I guess I'd just ask the person defending it: does your church look, in form and fruit, more like the one of the 1st century or more like the one of today?
99.999% of those asked, if they are honest, will have to confess the former. They'd also be forced to admit that their 'pastor' is like unto someone from the outside who is hired in to do a job and not like an elder from amoung them who is recognized and supported via individual free will for the worthy time and work he puts in.
Also, I'm not entirely certain that 'if not prohibited/abused then liberty' is actually a Biblical stance for the work and structure of the church. But neither am I sure it is not. At the risk of a very truncated quote, there is nevertheless something to..."hold firmly to the traditions, just as I delivered them to you."