sorry, this question is for you, not for me.
a few possible reasons are listed below:

★ own a beautiful and intriguing object
★ participate in this great global project
★ co-create Art, lock your own data in it
★ contribute to cultural production
★ pass it onto the future generations
★ be one of the Keepers who control its value
★ re-sell it later
★ look at it and think