Depends what you are serving. If you are going to host low traffic blog or site, that can go unpredictably offline and be offline for days, this is OK. I was d

Depends what you are serving. If you are going to host low traffic blog or site, that can go unpredictably offline and be offline for days, this is OK. I was doing this for some time and all the nuances with it (assuming electricity and internet are cheap, which isn't the case) makes it still unprofitable on the long run. ISPs usually have really bad upload, port blacklist (e.g. irc), connection unexpectedly drops during the night or day, DNS resolvers or forwarders usually are miss-configured and so on. Support for requests outside "my internet is not working" is often zero (e.g. "your DNS isn't configured properly"). I didn't even start with DDoS (ssh, http) attacks, port scans and even crawler hits (some crawlers by even reputable search engines can be nasty) - all these things will eat your monthly quota without even serving a byte of your site to human visitor. And don't forget visitor impatience these days - if site isn't loaded under a second or two, no more visits :)