It's really quite simple.  Everyone who helps each year does it for three reasons:

1. To continue a great tradition that started in 1986.

2. To spread holiday cheer!  (In fact, some participants do not celebrate Christmas.)

3. To provide the community a completely "giving" act of kindness, and nothing more!

But also, in 1897, 8-year old Virginia O’Hanlon wrote a letter to the New York Sun editor, stating: “I am 8 years old. Some of my little friends say there is no Santa Claus. Papa says ‘If you see it in The Sun it’s so.’ Please tell me the truth, is there a Santa Claus?" 

WaterskiingSanta

Mrs. Claus and the Merry Crew want everyone to come see Waterskiing Santa!

Why would anyone do a crazy thing, including getting in almost frozen water....

The Longest-Running Water Ski Christmas Show

On September 21st, the Sun published an unsigned editorial read that said, "Yes, Virginia, there is a Santa Claus. He exists as certainly as love and generosity and devotion exist, and you know that they abound and give to your life its highest beauty and joy. Alas! How dreary would be the world if there were no Santa Claus. It would be as dreary as if there were no Virginias. There would be no childlike faith then, no poetry, no romance to make tolerable this existence. We should have no enjoyment, except in sense and sight. The eternal light with which childhood fills the world would be extinguished."  You can see the full letter at https://www.washingtonpost.com/history/2018/12/22/is-there-santa-claus-how-childs-letter-inspired-classic-yes-virginia-response/.