My '81 R65, purchased in January, 1981 from Abt BMW, ( which is now Chicago BMW/ Harley) was $3295US, before taxes and registration.
The bike came with a Vetter Windjammer fairing, it didn't take long to learn, that I was not a 'fairing person', I returned the fairing to the dealer, in return for a replacement headlight bracket, that was cut to allow installation of the fairing.
A lot of people said I was crazy to pay that much for a 650 cc bike, at the time the Japanese bike manufacturers were dumping bikes into the US market.
You could get a 650 Yamaha for $1800US, new from a dealer, at least in the Chicago area, where I was living at the time.
Like Rob Valdez has said, at the time of the purchase, it was a lot of money, but this has been the most reliable vehicle I've owned, and I still look forward to getting on it and exploring the desert southwest, any chance I get.
I have an '02 R1150R, and this bike is a quantum leap from the R65, but still thoroughly enjoy riding the R65, it's only 100 pounds lighter than the 1150, but it feels 'weightless' compared to the bigger bike.