If you look into it, Oral Roberts (the first documented case of "send me your money and god will love you more") Jim Haggee, Joyce Myers, Benny Hinn, Richard Roberts, and a couple of other BIG evangelists that had ties to O.R.U. (most were on the B.O.D.) are currently or have or will be investigated for criminal activity..
Benny Hinn and Joyce Meyer were part of a Senate financial oversight committee investigation that was looking at large religious non-profit ministries (including their own) to insure that they were operating their finances in a way that was both appropriate to the donors and correct as far as tax and regulatory obligations. Hinn and Meyers operate fully transparent and open financial records anyway, and were accused of no wrongdoing whatsoever.
The Senator in charge of the committee stated that those two ministries are an example to all of above-the-board dealings and complete cooperation with the government.
Neither of those two persons or ministries are shady or in any way state that "if you give God will love you more." They are simply doing what they feel they are called to do (humanitarian aid, missions work, schools, tv and radio messages, etc. etc.), all of which relies solely on the donations of others--as is the case with all non-profit groups.
As far as their personal finances go, both of these two individuals make their money from their books and private speaking engagements, and at least at one point in time were actually taking no salary whatsoever from the donations to the ministry. This is also common practice among Christian ministries--working for free provided you have other means of income.