Actually, Krishna does not care for how much we give to Him, but He sees how much we are keeping back for ourselves. There is the story of Kholaveca Sridhara, a devotee of Lord Caitanya, who although he was a very poor man, gave half of his meager income for worshiping Mother Ganges, and by so doing, he greatly pleased the Lord.
Letter to Dharma, 22 April, 1972