A lot of spiritual teachers talk about tithing, but tithing can be overwhelming and not really doable if things are tight and you are in hand-to-mouth mode. Also, I personally feel a lot of places encourage tithing as a way to fill their own coffers, and not necessarily because they are really trying to teach you about money.
Consider that people will often get a lot of joy from finding a mere penny on the ground. We have a saying: “See a penny, pick it up, all day long, you’ll have good luck.” When you drop a penny on the ground, you are giving luck to other people.
What this exercise does is to help get you in the feeling of “flow.” It’s important to have fun with this and get some kicks out of creatively “spreading pennies” around.