I grew up in Scotland, now live in England and have lived in America. When I lived in Scotland it was pretty much a non-event except for parties at school etc. when I was a kid and we dressed up and played games.
In America, it was actually rather cute. There was no asking for money. In my neighbourhood, you would see little groups of young children dressed up in great little costumes going around trick or treating with some parents in tow. As far as my experience of it was, it was quite charming, people generally got involved and made it fun; it was a simple case of sweets/candy being OFFERED out as a "reward" for the kids' costumes. That's how I saw it - as did many of my neighbours. It was light hearted fun and frankly, there's so much negativity in the world these days, handing out a few sweets to a VERY little and VERY cute ghost and her friends put a smile on my face! I actually looked forward to it - some of the kids were adorable and they were always polite when they came to my door. None of them ever ASKED for sweets, money or anything. I would comment on how great their costumes were, enjoy a bit of fun with them, and then offer them some sweets, which they would politely thank me for. I always found it quite charming and fun.
It was an unwritten rule that if you had your porch light on, it was okay for kids to come to the door. If your porch light was off, then that person preferred not to participate, and the kids where I lived were very respectful of that.
When I returned to the UK, with the internet being what it is, many of the American ideas had come over here and now things like halloween decorations and much better costumes are seen around, along with pumpkin carving and the like. I rather like it. So if a few kids want to dress up and knock on my door, I have no objection to handing out a few sweets and indulging what is a bit of fun for kids! Jeez, there's surely enough to get down about - some kids dressed up in funny/cute/silly costumes is the least of my worries.
I'll be getting stocked up this week - if any kids come to my door in costumes they'll get rewarded with some sweets. If they don't... well, plenty sweets left over for Xmas... and for me! :-)