Have you ever heard the phrase "Think globally, act locally"? This is the essence of RLSH.
We all want to change the world, but as individuals, with daily lives of our own and families to support in many cases, we can only do so much. Even with all that you have achieved yourself, you must recognize this, or you wouldn't be here asking how we can do more.
In costume, RLSH can inspire others to do good in their communities. The simple act of helping a homeless person eat for one more night can inspire others to volunteer at soup kitchens, hand out meals themselves, or even contact a homeless relative.
One homeless man in my city was given a laptop computer, which he used to find a good job. Another was given access to a phone, and was able to contact his ailing daughter. He went to live with her, got a job (he has a degree in metallurgy) and was able to spend quality time with her before she died. Another man, a veteran, was referred to a hospital job in Seattle, where he is still employed three years later.
Small, local efforts have far reaching effects. With every action we take, we DO have global repercussions. While uniting many RLSH is not feasible long term, there are events like HOPE, where larger numbers can join temporarily to do more for more people, but the local efforts of individuals are the crux of RLSH activity.