$75k is fair market value for a brand new classic 5er or 6er, even undervalued in today's market.
Consider that a 1992 318i with only 4500km all original (even tires) recently sold for $60,000 USD through the bidding wars. The cars in the dealership are older, rarer, and more desirable. (not to mention loaded with the optional and expensive BBS rims, spoiler, and painted grill) --- rare factory options = worth more.
Not your everyday classic BMW's.
The place is obviously still cleaned.and cared for to some extent. These cars really should be restored to original and sold for a healthy profit.