The world is full of dangers and difficulties and people who are just plain dislikeable. It would be foolish to just welcome the whole world in with open arms. Thank goodness for fools.
What helps you to stretch your arms open wider?
Evolution has designed flowers to serve as beacons of welcome, using color, scent and shape to draw in bees and other pollinators. The reproduction strategy of the flowers is inseparable from the food strategy of the bees.
How have you benefited from giving something away?