The cycling helmets will not suffering a lot of damage during the slight falling down, but it may catch the problem of that front visor has broken, the screw was missing, or some small gasket was missing in the process of storage, even if it is just a little troubles but also can cause the convenience.
At the moment the helmets from domestic did not have supplier markets for spare components, in this way we may have to keep to use it or find the way to repair by ourselves, the riders with high demand may abandon the whole helmet; while in abroad it is easy to find the spare components from the market, making sure everybody could own its integrity helmet in good situation.
It also has the disadvantage of the high cost for the spare components, sometimes the cost will be the same as a new medium range helmet, but overall most of us would prefer to buy the spare components than to buy a new helmet, and it is up to receptivity of riders.