Fair or Not?

For me, it's not fair to a poor person to plant in his conviction or his conscience, though not really obliged directly, to give out 10% of his everything as a form of obedience to God, when that 10% could be used to feed His own family. And, it might cause for a rich person to be greedy, if he only give out 10% as a tithe and think It pleases and obeyed God, when In reality he can and able give out 90% of it and can live 10% of His everything. Tithe (1/10) is specific and kinda like measured, A person can find it very difficult to comply because for him, its equivalent to one whole day meal of his child and for the rich man, that 10% is nothing and can easily comply without much struggling. Yet, both are obedience, the only difference is that, the other one is obeying in the expense of a meal for his child and the other seems nothing. Whilst if we don't use tithe but giving without specific measurement, a poor person may give lesser or any amount as he is able and cheerfully without affecting the needs of His family and in his conscience, it pleases God and don't have that guilt feeling. And, a rich person may give as much as he have and left only just or even more than enough for the needs of his family as long as he is willing and able to give it out not grudgingly but cheerfully. In this case, 1% of that poor person, is equivalent to 90% of the rich man since both of their remaining balance are enough for the needs of their family. They both feel the joy and sacrifice of giving without affecting the needs of their own family and the future of their children. As the bible say: 

“But if anyone does not provide for his own, and especially for those of his household, he has denied the faith and is worse than an unbeliever.” I Timothy 5:8 NKJV

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Will a man Rob God?