No life without Sun
What I feel is since the celebrities have a mass appeal they should not advertise for products that are of inferior quality. They should check and if possible use those products to satisfy themselves about the quality of those products. They should remember they also have a responsibility towards society and should not shamelessly campaign for the products because of money. I used the term shameless because I find a few celebrities endorsing some products which do not go well with their images. They have enough money and if they do not promote those products it is not going to alter their economic conditions. By doing these kinds of promotions, I think they are losing their images to some extent.
"Life is easier when you enjoy what you do"
So even if the quality of that particular product decreases, the celebrity has nothing to do with it as he or she has already taken the sponsorship amount in advance for a particular contract period and if the quality deteriorates he or she will not extend the contract further.
Knowledge is power.
All celebrities want money and name for them. By making some short video showing them for various product may be beneficial to be near to the people and they will earn money. But, we can' go for those products simply by seeing them. See and enjoy but don't come to an understanding of quality without using the product on your own.No advertiser will give guarantee in writing. It is the people who have to decide whether to use or not.