It's all about the imagined Mojo. Plus the B3 is one heavy sucker (ask me how I know).
No lie! I was Stage Manager for a band that carried a B-3 & 2 Leslies, in flight cases. The Hammond was about 300 lbs -
sans protection. Another band we carried a piano. It was about 400. One of the rooms we played regularly had a 6' stage; 2 others were on the second floor.
But they both
sounded way better than the fake ones!
Peter (Who, yes, has had 2 back surgeries......)