I'm happy, and I don't feel that I'm doing anything wrong since everyone around me is using the same ISP.
That's cool that you're happy, and I'm sure if the neighbor taps into your gas line it'll be cool, coz I'm sure you use the same utlity provider

Seriously though, connecting to an unsecured network can be bad for you, in that their network may be populated with machines loaded with viruses, malware, who knows. The fact that their WAP is not locked down increases this likelyhood greatly, if they can't lock down their access point, what makes you think they can run antivirus regularly.
Even if I was a "share and share alike" kind of guy, I would be hesitant to let my neighbors surf on my dime. What if they have a penchant for p2p networks, pornography, threatening e-mails, etc.? First place the knock on the door will come is the source of the network traffic - which would be the unsecured router. Even if I plead innocent, my computers will likely be impounded and scrutinized. I'm not worried about the content of my machines, but having them confiscated indefinitely is something I don't want to ever worry about.
Part of the problem is the marketing people making is sound like plug n play, no muss, no fuss. Part of the problem is people believeing marketing departments, and not reading their documentation. And finally the ISP's that ship equipment in an unsecured configuration. I'm happy to say that mine had the WAP built into my DSL router disabled by default.
So I guess my answer is never.
P.S. - hope you're DSL problem is remedied soon
