I think its a well known fact that most end up in the bin, I did read once that there was only a 2% response to flyers. As for flyers for takeaway food, wouldn't touch with a barge pole. In answer to your post, never, to many terms and conditions follow, that are not on the flyer, whatever it may be for.
At least twice, Baz......recently for a gardener and a few years ago for toning tables at a gym. Three friends joined the toning tables on my recommendation and a couple of others on theirs.....so that flyer worked well for the gym...x
We get loads of charity bags here but never use them. There have been reports locally of gangs going around and taking the filled ones before the genuine collectors arrive. Our used clothes etc. go directly to the local charity shop.