What is considered as high mileage?

Looking at a few used CBR500Rs and I've seen a few with higher then the others
Is 48,000km (30,000 miles) to high for a bike? Its the 2019 model so the split will be ~6000 a year if we do the calculation.
I know 30,000 miles for a car is considered as almost new (at least here)
What about bikes?
Also saw a 2021 model go for cheaper than normal with 28,000km (17,500 miles) but the owner slid with it so it has a little cosmetic damage
Are there any risks of buying a motorcycle that was slid? If its 100% good mechanically should I be worried about anything else?
I don't really mind the cosmetic damage because it lowers the price by quite a bit and its also my first bike so high chance I'll slide somewhere or even drop it lol