They do this because on a deep subconscious level they believe that this is the right thing to do. They will quickly give money to those in need and have a genuine desire to assist people in their troubles.
Leos are also known for giving freely plenty of advice to those around them, about everything, and are known to be better at dealing out advice then tending to their own troubles.
Many Leos even have hair resembling the thick mane of the Lion.
A fixed fire sign of summer, Leo is ruled by the Sun and in many ways is like the Sun itself.
They love to be flattered, regardless of sincerity and tend to flatter others with statements that are simply not coming from their heart.