First off, 10Mbps is not enough for a shared connection. 10 users and you're down to 3G speeds, 100 users and we're talking ISDN. I think you get the picture.
Second, shared WiFi, is it secure? I mean, I'm not that familiar with WiFi security standards, but even if data on the network is encrypted with, say, WPA or WEP, isn't all that data encrypted with the same key? I.e. you can put a password on your WiFi to keep your neighbors from sniffing your traffic, but anyone with that password has the access they need. Therefore, if I'm sharing WiFi with my neighbors, couldn't they be sniffing out all my traffic? And if you think that's paranoid, you think a technologically savvy neighbor who weeds through your garbage and watches the whole neighborhood with binoculars are takes pictures of you in your house wouldn't also sniff your internet traffic if they could? If you have an unsecured WiFi network, who says they aren't already?
Unless there is point-to-point security (e.g. encryption between WiFi station and individual WiFi receivers) I wouldn't trust this. Of course, this makes me wonder what kind of security cable internet employs. Could my neighbor be sniffing my cable internet traffic, since that's also a shared resource?