Is Flyer Distribution effective???????????

Nowadays , you can see most of the businesses and organisations marketing with flyers as an advert. But do you know how effective it is???? As I am not studying marketing course, I cannot tell surely although one thing I am sure is that it is not as effective as they thought. Well, is it the fault of advertisers or the fault of flyer distributors ??? The answer is simply that NO ONE...... Although there is effectiveness of flyers, the difference between advert cost and resultant cost is very large..........So, we should take this into consideration. I will show you guys with an example.>>> All the advertisers practise this method with the hope that flyer distributors will manage to persuade the people to buy their products. But unfortunately, most of the distributors just distribute them in the sake of payment and they may not do properly... just give them to the people...... What about the perceptions of people???????? They are just afraid to lose face and so they just take the flyers given to them >>> very soon, while walking, they throw away all the flyers >>> I dont mean all the people but most of them do like that >>> some people do not even want to take these flyers. Of course, sometimes , this is effective but less percentage..... Besides, some people may often assume that a product advertised like that is not so good in quality and as a result, they dont wanna buy this product. U may feel that this is just superstition but sometimes this assumption is also true>>>>> So, will we continue practising this method??????????????