I mean most people know that fast food is bad, but everybody eat it anyway. What do you think?
I think it depends. The economy, global issues, what's happening where the product is released, price, income, preference etc. If say the product were food, the worst, most distasteful and gross food, were being sold somewhere with hunger and poverty at a ridiculously low price, it could survive. It also depends what you mean by worst, your example of fast food while being unhealthy, is considered fairly tasty for many, when talking about health it might be the worst, if talking about taste it could be great. The demand for a product can be altered by too many factors
Yes, I believe average people (making up the majority of the population) can be led by good marketing, by media, by hollywood.. to basically do anything they're told. There is not a lot of thinking in the "average" person.
I think so. But its like they say "What goes up must come down" so even the best products at one point are gonna fail
Not for very long....proof is in the pudding....bad product, rapidly diminishing profit potential