You inevitably become too comfortable in your own surroundings..
The Aussies come half way around the globe and head to Britain, Poland or Sweden..
No surprise that a fair proportion of those that do it, go on to a much higher level than their UK counterparts...
The Poles usually stay put and develop, but they run the risk of losing a team place if they don't perform, given the potential over there of so many, hence they either develop upwards or disappear quickly from the upper echolons....