I do not think tithing ITSELF can cause blessings, but how you feel when you tith. For example a man who makes 500 a week, and while he takes out the 50 dollars for the tith he thinks man what I could use this money for... I'm sure God doesn't appreciate that, but a man who not only tiths yet gives more HAPPILY, God will have favor with him. I'm not saying to give more then 10% but when you tith to be glad and know what God has done for you and be sure about what you are doing.