Keep in mind that Colorado is a lot better off, legally, because the ski industry is such a vital industry for the state.  Lawmakers are willing to protect Colorado ski resorts because the ski industry is big enough to make a difference in politics, but in most states it is not.  Even if every single skier in New Jersey  wrote their lawmaker, that's still probably not a big enough group to make a difference.
Also, to a large extent, the invert bans are "empty threats".  The ski area probably does not care too much what you do, but they just want to be protected from potential lawsuits.  When I used to ski at Bridger Bowl inverts were banned, but no matter how many times we got warned for doing them, we never actually got our passes pulled.  After all, ski patrollers are usually pretty avid skiers and don't like policing any more than you like being policed.