I think it depends on the situation, I have friends who have PR already and going back is not really an issue , however for us, we have a 457 and as we have been here 2 years was about to begin the PR process but things have changed a little . The job we have over here is not on the skills list and therefore we would have to go for a employer sponsered PR , and they must say that the job is secure for the 2 years after the PR is granted .Who can say that with certainty these days and therefore we may not be able to stay where we are , where we have made a real effort to get on and fit in. The thought of returning to the UK is fine with me as we came on a"whim" just to see how it went , but my husband is fretting now that as we are getting onto 40 years old once we leave with no PR , or citizenship , there will be no chance of a return. I think people come with a certain view of how things will be and then work/ location etc change and going back is a safe option. Financially too , it costs for everything here if you don't have PR and we have missed out on so many helpful benefits that our friends have and find it quite difficult to afford holidays etc , so it's not as rosy as we thought it was going to be. It's a dream to live here really but sometimes it just does not tick all the boxes.