Why do the Grateful Dead keep getting bigger?

Despite the fact the original lineup disbanded decades ago, the Grateful Dead continue to get bigger and bigger. So, why is that?

Michael Doherty's Music Log: Grateful Dead: “Road Trips Vol. 4 No

Trying to get into the grateful dead found this chart, what's the

Lyrics for Truckin' by Grateful Dead - Songfacts

The Grateful Dead Revisited : A 1976 Interview with Jerry Garcia

Grateful Dead Drummer Bill Kreutzmann On The Discipline Of Being Free

Grateful Dead Graphic T-Shirt

My Favorite Grateful Dead Song: Dave Matthews, Black Keys and More

Grateful Dead Channel - SiriusXM Canada

Dale Maplethorpe

Campaigns :: RIP it up and start again: Grateful Dead allow fans

The Grateful Dead Tie Record For Most Top 40 Albums on Billboard

Bob Weir on Meeting Jerry Garcia and Starting The Grateful Dead

The Grateful Dead Is Resurrected Once More, This Time With John