@Jeruba It all depends on how scrupulous you are, yourself. You want a good fit with a company. There are different perspectives on sales techniques, and I think that if you research a company, you can get an idea about their approach, and whether you fit with it or not.
Some people are so desperate for jobs, that they will try to pitch themselves in any way they can. They will try to change for the employer. While, I don’t think this is helpful in the long run, it could work. In any case, I do think you should research the company carefully, looking for clues about the culture, and thinking about whether you fit in there.
You may not be able to learn if a company is corrupt at the top, but you can surely get an idea as to the culture, and then make guesses about what top management is like. I wouldn’t apply for a job as an “unscrupulous money-grubber” unless I was an unscrupulous money-grubber. It’s the kind of thing that is hard to pretend to be if it goes against your principles.