Contrary to popular belief, the tithes aren't there for just "helping people." Tithes are for the purpose of supporting qualified people who teach Torah, and to provide for the operation of the priesthood, and to support those in need - and believe it or not - once it's left your hand, it's no longer your business as to what's done with it. Your obligation is to tithe your part...
YES, if the pastor is wasting the money and buying planes, trains, automobiles and yachts, then he's clearly got a blind flock that tithes too much, because an extravagant lifestyle earned off YHWH's FREE Word, was NEVER the intention of tithes ... and SHAM on that pastor or rabbi for using YHWH and His Word to expand their own domains!
The original instructions concerning tithes was for the Levite Priests who were set-apart as YHWH's; and had NO OTHER way of supporting themselves, because their job was ONLY to do YHWH's will/teachings, etc. Their ONLY business was conducting the duties of educating, blessing, performing sacrifices and exercising judgment of Torah. But they also needed to be housed, and fed.
What we must ask ourselves today is: WHO is actually TEACHING YHWH's Word? The answer: Not many.
And, here's an interesting tidbit: Did you know that when people who receive help from the church in some way (unless they are told otherwise) are actually REQUIRED via Scripture to PAY BACK anything they "borrow" from the tithes, including interest of one-fifth of what they borrowed?
Leviticus 27:30 “‘All the tenth given from the land, whether from planted seed or fruit from trees, belongs to Adonai; it is holy to Adonai. 31 If someone wants to redeem any of his tenth, he must add to it one-fifth. (CJB)
In other words - once your "tithe" leaves your hands, it belongs to YHWH. If the person who receives it ABUSES it, YHWH will deal with him or her at some point.
The above is simply something to keep in mind the next time you tithe...