Contrary to some here, it is not Hagee's "opinion" that Christians ought to tithe. He strongly links it to a Christian's obligation and God's "plan for your prosperity." According to Hagee, "when you plant your seed (tithe and offering), God not only meets your need, but rains down His blessing on every area of your life. He is the God of more than enough!" "Giving is the only proof you have that the cancer of greed has not consumed you. The day is going to come when all you will have is what you have given to God." "Givers gain! When you give to God, the only thing that can happen is for you to gain on every level. Beloved, He wants to prosper you in all things. Are you willing to trust Him with the little that is in your hand, for the untold blessings in His?" [John Hagee Ministries]
Of note is his comment that giving money to God "is the only proof you have that the cancer of greed has not consumed you." What an extraordinary thing to say. It is almost like saying "Chopping off your left hand is the only proof you have that you appreciate the right hand."
I would venture to say that Hagee preaches the prosperity plan and, by extension, the obligatory tithe, because he is greedy.
Hannah J Paul