Gecko's entry into the home indicates that wealthy families will flourish, because Gecko's alias is "Shougong", which is also called Tianlong in China traditional culture. He is good at climbing over the eaves and walls, and is regarded by the people as an auspicious thing to drive away evil spirits and prosper the family.
Of course, this is just a superstition. In fact, if there are geckos at home, it proves that there are many mosquitoes at home, or the cleaning work at home is not in place. This is because geckos are easy to appear in places where environmental debris accumulates.