I never said all preachers are swindlers, but many are. And, they come in the form of small and huge mega churches. As I said, I have been in shack churches and huge mega churches. Being rich isn't the problem, it is the oppulence and attitude of "I deserve/need these things." An ignorant flock nurses these types of swindlers. It is as much the Church's fault as it is the wolves in sheep's clothing.
As for the salary issue, I think that is something the flock also shares blame for. The flock is supposed to give their tithes of increase to the preacher. That is his "salary." The church for a preacher is his house, or at least should be. I know plenty of churches - big and small, teaching and lacking - that housed the preacher, his wife, and/or childrenl. And, the flock were people who had trades - doctors, smiths, lawyers, scientists, etc. So, they built things, tended to medical emergencies, helped with gardens - all type of things that were primarily for the preacher, but shared by the flock. It is possible; being a preacher isn't about the biggest flock or most money. You should be able to go everywhere you need to go to minister with absolutely nothing. You don't have to, but if the flock helped modern preachers like the Hebrews treated Levite priests, they wouldn't need a salary.
They certainly don't need a salary, non-profit non-taxables, non-taxable donations, etc. And, there are many preachers either too scared of losing their flock to teach the bible as it should be taught - with all of the controversial language, or they do not simply because of ignorance or conscious witholdal.