I couldn't do it myself, but mostly because my ex is completely useless & I don't trust him as far as I could throw him.
I would love the opportunity to give my kids a better future with the possibility of working away on my mind. Maybe one day when they're a bit older, if my mum was willing to care for them I would.
Good luck & I hope it works out. I think its more general that kids are with their mother, but its less common than you'd think