And for the same reason, I wouldn't like to find out the limits. Instead, I'm much more comfortable with a server that I know can take it. I do monitor it sometimes, but I don't need to worry about it this way and wonder when we'll hit our limits.That's a worry of mine too, as to why I want to learn load balancing.
I think it's even possible to see where you're getting the most traffic (like US: East or West coast, Canada, UK, or Aussie, etc.) and load balancing judges based on that to pop an instance up in that location so that the processing speeds aren't only better, but response times too. Someone with more knowledge would have to correct me on that, but if that's true, that is one of the most awesome aspects I find with it.