I grew up in the Bay Area and I'm pretty familiar with The Dead. I 'm not baggin' on the Grateful Dead, I love the Grateful Dead saw them 13 times (the real Dead not ever with John Mayer always with Jerry). Compared to The Beatles like you say that is a pittance, when they weigh in at a mere 177 million just in the States and worldwide top over 600 million. Hell I have 8 different copies of The Beatles aka The White Album, 7 different copies of Pepper and about 5 different copies of Abbey Road. I have them in all different formats. I would have 9 copies of The White Album but my friend about 30 years ago borrowed my 8 track version of it and never returned it.
I listen to music any way I can. Live, CD's, Vinyl, XM radio, and it the car it is just to easy to yell at Alexa and get something played hands free while driving.