Could be, too, that folks might be willing to invest $80 knowing that their money is going, or largely going, toward a charity but wouldn't be willing to simply risk $80 on a 1 in 100 chance they'll get a '68 BSA. At least w/ the charity aspect they'll get a feel-good benefit from the expenditure otherwise spending the same $80 in a slot machine might still give the same end results but could be more fun while you lose your money.
Great looking BSA, though.