First, I tithe, even sometimes when I'm not sure I will be able to pay my own bills. Tithing works, unless you're doing it for personal gain.
In My Opinion, if you send money to someone who lives in a mansion, with a garage full of expensive cars, you might as well throw your money out of your car window and hope some homeless person finds it. Do a search on religious scams and see what you come up with. Political organizations masquerading as religious organizations in some cases, when working for poor or disadvantaged or spreading the gospel is not their primary concern.
If you give your money, make sure you can actually see some results from it. Give to your local Church or organization that helps spread the gospel through their actions. You don't have to give money you don't have or can't afford. Your time and personal contact or help is worth more in many cases.
If you think this subject touches a nerve? You are absolutely correct. Not much, if anything, worse than people making their fortunes from the poor and claiming they do it for God. TV preachers are the worst. IMO.