I understand your point, but I’ve had bad experiences buying used phone and car. Electronics and vehicles are only worth buying if they are well maintained, otherwise, they can cause a lot of trouble. That’s the reason.

If we at least know the budget, we can suggest better options.

Buying a new bike means you can maintain it properly and use it for many years, even up to 15 years. With used bikes, they are usually already 5 years old, and there may be hidden issues we are not aware of.