Summarize your reasons in the introduction.
These are so attractive that we cannot refuse to buy them
Of course we can. It's easy, really.
they often interrupt some of the interesting programs, which make the viewer dissatisfied.
True enough. Some people won't even watch tv anymore -- they just download the shows they want to watch, with the ads removed.
Last year, there was a scandal of the company selling milk.
Name names, cite details.
You are on the right track. Your grammar could use some polishing, but the errors don't really obscure your meaning most of the time.