He may be a collector.
I know a guy that is & a VERY SMALL PART of his collection includes a 67,68 & 69 bonnieville with the highest having 11kms (6 miles)on the clock.
He starts them every 6 months & changes the oil.
He also has every BSA goldstar ever made as well as a number of early BSA,s.
Yes,,,,, his shed is alarmed