Image the Internet connection drops because of a faulty router. But there are other routers available (and working!), you just don't know which of the connected neighbors will get mad if you switch cables.
It might be that one of your neighbors:
- is out of town
- doesn't need Internet that bad
- rarely uses his Internet connection
- may call ISP in 2-3 days to come and figure out the problem (while being calm)
- understands your addiction (and doesn't want to see some weird Internet withdrawal symptoms)
Having such neighbors provides you a way to quickly gain access to the Internet when needed. But for this you need to know them. Failure to do so is risky as you might end up cutting the Internet connection of some psycho whose reaction cannot be predicted.