In our local market here (Silicon Valley) the economy is not too bad these days, so somewhere between $1000 to $2000.
In the eyes of a buyer who want to ride it, he's immediately out $100 to $200 for a seat. Also, tires are hard to see in the picture, if it needs tires to be a rider, that's another $200 +/-.
The mileage on it means
- valve adjustment check
- oil/filter change
- maybe new air filter, spark plugs, fuel tank flush
If the bike had not run in a while, and it turns over, the carbs will need to be pulled, disassembled and cleaned, especially pilot jets and passageways.
If the motor is stuck, all bets are off. It takes a certain kind of fanatic, of which I am one, to buy a cb750 with a stuck motor.
In your case, I would not take the bike on trade if it has a stuck motor -- too hard to turn around and re-sell.