You probably dont see it used as much in commercials gyms because alot of commercials gyns dont have specialty bars, like the trap bar, needed for the lift. Same reason wjy you dont see alot of beople doing safety squat bar squats in commercial gyms across the country. But you you go to a true Stregnth and and conditiong facitity, which are becoming more popular and common then you more then likely will find that equipment.
If your a competitive sports athlete like a football player, basketball player, baseball player, etc trap bar deads are better suited for you to then standard deads as you have more range of motion and the position in which you generate force from better translate over to positions you'll need to produce force from during a football play or basket ball game...