"I cannot see anything wrong with having to prove you are able to support your family before moving to a new country. It happens in Australia, New Zealand and Canada and many more"
Yes I can attest to that GG, many years ago when I was married to my first husband we applied to go and live in Australia, he was working for a big American bank and had been told he could get a transfer to Australia if he wanted it. He was from overseas anyway and a lot of his family were there already. I remember going to an interview at I think Australia House which was quite gruelling. They wanted to know that we had somewhere to stay in the form of sponsors, how much money we were going to be bringing with us, we had a house to sell and they wanted to know chapter and verse how much equity we had in it, confirmation of husband's prospective employment. We were also told that we wouldn't be eligible for any form of benefits until we had worked for 7 years and put something back into their system. The rather snappy interviewer also told me that I'd be more of a problem, as husband had already uprooted himself once so was therefore more adaptable, but I'd be homesick
That interview wasn't a particularly pleasant experience and the resounding message was "we don't want anyone to be a burden on our country" We did however get the required residents' visa stamps in our passports, but in the end we had second thoughts, my husband told me "I don't want to go, I think I'd really miss England too much, among other things, I love the seasons here", just didn't want those everlasting blue skies 
I have also read recently that Australia plans to deport a very old grandma back to England, all her family are there, she's in her 90s and the elderly persons' home she is in has become too expensive after she suffered a stroke, she has no remaining relatives here. Plus also a family with a young child who needs expensive specialist health care, have also been asked to leave. Ruthless were my thoughts !