The phrase "expensive gimmick" refers to something that is costly and is seen as a trick or a flashy feature intended to attract attention, but ultimately lacks real value or purpose. Full definition
Over-saturation, lack of innovation and expensive gimmicks not compatible between versions are what screwed up these games. (gonintendo.com)
Just as 3D went from an expensive gimmick to an expected feature, so too will all televisions eventually have higher resolution. (canadianbusiness.com)
We created a beautiful but affordable electric toothbrush (and oral care range) that focuses only on the basics and ignores the expensive gimmicks. (thewirecutter.com)