Most of us on this board (with some exceptions) move here to be with a significant other or spouse. The US is far from perfect though, and I love my new home.
I personally was a bit of a Britophile (I would say Anglophile, but it's not that accurate). Most of my family is two to four generations from the UK, mostly from North Wales, but some from Scotland and Ireland. We lived in an area where there was a high concentration of Welsh immigration due to the slate quarries, so even now there are a lot of families who use Welsh words for things, even if their grandparents or great-grandparents were the last fluent speakers of Welsh in their family. Even though I always felt an affinity for the UK, I never seriously thought of living here.
The weather here isn't that bad, especially compared to some parts of the States which is much colder or much wetter. And the summers, even in the north can be horrible. Plus, no offence to any Floridinians, I WOULD live in Florida if you paid me, but it would be a pretty tidy sum. And my husband would have to come with me.