"James
I like to at least have some personal pride about it, but all the stooges here take it all sub-emotionally and will not celebrate at all and then massively judge you if you say anything in chat about it or try to be sociable there for that matter. Maybe it has changed actually since I last was properly in this game a few months ago, but I very much doubt it.
We do celebrate, but winning in iGP a thousand times easier than say any competitive racing series in real life, so it's as big of a deal as you might think.
If I win a F1 world drivers' championship or 24 hrs of Le Mans or Indy 500 I'll celebrate like crazy :P