Exactly. I also wonder whether it would even have been possible to start Jetbrains in the US. Being based in the Czech Republic gave them a much lower cost structure, and in the beginning, competing with Eclipse's free price tag meant noone could ever have supported a sizable company in the US.
Czech Republic is just a registration place. JetBrains is based in St Petersburg, Russia. Until recently all the developers were in St Petersburg, then some people moved to Germany. JetBrains was started as a small startup and then absorbed people from St Petersburg office of Borland.