The Black Bomber is the bike that walked into England and kicked their motorcycle industry into a pit ala 300. Well, it had been heading that way for awhile, but many believe the Bomber was the final death nail.
Its also basically the first "big bike" that Honda brought to the world market. Its speed, reliablity, style and high build quality we're basically unheard of at the time. A real sign of things to come (read: Hondas CB750, Yamahas TX650, Suzukis T500 and so on).
As Rich stated, the above reasons and other have deemed the Bomber a truly iconic machine (not to mention it being one of the most beautiful production bikes ever built).Combined with the very low in comparison to the European and American competitors less eloquent and reliable bikes prices, many were purchased as commuters and simply didn't survive. The general concensus of many American riders at the time (and today) was that the Japanese, amd especially the Hondas, motorbikes were basically throw aways. Ride them till they die and buy another. Not unlike the VWs of the era.
There are so many stories told today by riders of the time beginning with "if I knew how much that old Jap bike I had would be worth today" it's comical.
So, yeah... My 2 cents. Also, no matter how desireable or rare $800 is fucking ridiculous.