The easy answer, I suppose, is that my husband is here, his business is here and he couldn't uproot that very easily even if we wanted to move ... which we don't.
Also, I have more friends and family here than I do in the US. I feel at home here. I fit in here.
I like that I don't live anywhere near a lot of fast food places, or giant megastores (i.e., Target, WalMart, etc.). I like that people walk places. I like that people go to pubs with their families. I like that the shops don't have 800 varieties of everything. I like that people care about the sourcing of their food. I like the television. I like the weather.
But it's more than that. There are a lot of intangible reasons I feel as I do. My quality of life here is infinitely better than it ever was in the US. Life here is more relaxed, people don't take themselves so seriously, people's priorities are more in line with my own, I don't know any workaholics here, things seem more natural, I eat better food and I just have the sensation of having a much closer tie with the countryside and nature.
The thought of moving back has never occurred to me. I can't imagine a scenario in which that would ever be an option.