The prices of cb750 (K0-8) are not affected by seasonal changes because they have achieved a collector status. Everybody more or less knows what they are worth.
The economy and demographics are more of an issue. The 40+ age of more affluent have decided to buy these bikes to go back in time, so they are desirable. The economy of 2000-2008 pushed the prices up. I am talking clean examples and not garbage.
Currently, the economy is questionable, There has been dumping of collectibles recently. Also, as the ages of people who are getting older and dying, the interest is dying too. How many people want a model T Ford anymore?
There were literally millions of cb750 built from 1969 to 1978. 7414 were sandcast. I had 4 in my garage at one time. So, even sandcast are not that rare as people would have you think.
Ultimately, the prices will go down except for exceptional original cb750s. Very few absolutely original cb750s exist. Buy if you want one, but realize the investment time was during the 1995 to 2006 era.
I disagree with that idea.
Many young men are buying Honda CB750's because they CAN afford them and they cannot go buy a $7,000 dollar motorcycle.
The wealthy will always buy what they want ,new or vintage.
"The 40+ age of more affluent" Many people that are 40+ are not affluent. They usually do have credit and a job at that age though.
And many 40+ have served in the military and have a job or can get credit.
Most all of the young men now have not served in the military because they did NOT HAVE TOO.
So many of them may not have worked or earned any money .
If you have served in the military you have some work experience to build on.
All of the older motorcycles are getting more attention now because the parts were simple , a lot of parts still exist and are a reasonable price. No $600 black boxes or plastic panels.
$700-1500 dollar garbage can mufflers and $700 dollar foot rests.
The new bikes are extremely expensive to own and repair. Also the new bikes do not have steel frames that are rebuildable. They have cheap throw away aluminum frames that cannot be repaired easily and will not last as long. The aluminum frames make them easy to ship and easy to recycle but lousy for lasting a long time or rebuilding 30 years later.
I think many people are waking up to the fact that the older motorcycles were a great value for the money and were built to last with good materials and were simple to repair for the guy at home.
We are in a depression and things of VALUE are taking center stage. IF it is well made ,simple to repair, easy to get more parts etc.,.
California really messed up years ago when it made the California Inventory TAX Law and many motorcycle and car parts were thrown away or the owners of the yards would get charged tax on all of the perts they had in stock.
Now many car and other parts are stored in warehouses in NEVADA then shipped into California as needed.
Of course that cost a lot of fuel and pollution. A stupid California law that should be changed.
Many people were just sick when all of those vintage car pars were thrown away.
Not that many people restore vintage cars and motorcycles. But it is a important industry.
It provides jobs, and brings in revenue.