So what about the other 99% of the people who cannot read what's being posted in non-English? How are they supposed to read it, respond to it?
Yes you can set the language, but it won't translate things for you. Therefore you'd end up with a large English forum, and smaller forums in Italian, German and any other language you care to mention. Someone would still have to translate the content.
translating all of the content would be far too much work. but having a german, an italian, etc. forum would mean more popularity and i guess every italian, german, etc. visitor who knows a bit of english would check out the english version as well!
=> more visitors!
nico