Exactly. Cheap bikes are made out of aluminum, which can fail at any time without warning and cause injury or death. Much better just to pay extra for carbon / steel / titanium. Carbon still fails, but there are more likely to be warnings first, and even if it does fail completely you're not likely to puncture a lung or whatever from it getting impaled through your chest. Steel and titanium shouldn't fail at all unless you're in a bad accident first. Bikes are great, but you need to take seriously the fact that they can cause serious injury or death.