Is 37,xxx miles alot for a 2000 cbr f4?

I think its high. Hell I'm getting rid of my bike when it gets around 15K. But your prolly getting it for a much more reasonable price so go for it. Its like the same as buying a car with 100,000 miles. Theres always a CHANCE something could break or go wrong or it could drive another 150,000 miles. The only thing you can do is make sure it runs and shifts fine without any problems or noises and then ride!