A Price for God's Blessings?!

I do not claim to be an expert on religion but it could be safely said that believers wish for God's blessings. But is God's blessings abundant or is it scarce? Any scarce commodity carries a price in the market.Price need not mean only the amount of money needed for a unit of a commodity. It could also mean the inconveniences or sacrifices one has to undergo to get what one desires. It was mentioned by one of my students that offerings of cash is a price for God's blessings. What is your opinion...?