At one company I worked at the marketing department did a study of consumer preferences to things like color, style, etc. One of the things they tested for was weight. They found by putting an iron slug at the bottom of the box, people judged it to be "higher quality".
We thought that was funny, but the company never acted on that marketing info. The thing to be careful of is that if you plan on having your company continue to exist for a long time, don't be caught doing cheap and sleazy things for short term gains.
I designed an Sony interface for one company, and after I did the higher end 8 channel product, they came out with two product versions from it. The lower end product was the same electronics, but the other four channels were not wired to the panel. It was half price. I don't think anybody got cheater by that. It was a marketing decision, and they decided they need to cover the high and low end, and it was cheaper to do it with only one production board.
I've designed a lot of stuff, and never have I been asked to do anything that I thought was shady in the electrical design. Shady stuff normally comes from the marketing department, it's their job, not mine.