I would think you can accomplish the same goal with offset rims or spacers, move the tires out a bit!
Long travel kits are an entirely different story.
Some here could greatly benefit from adding the long travel kit while others can't.
If overall width is never a concern and you have a deep pocket then I am sure the LT kit will add alot to the ride and performance. Keep in mind these get mighty expensive and pretty quick. I think you need new shocks, new axels, new brake lines, new steering rods, new A frames and lots of other parts that may or may not be included in the kit.
It's safe to say the sky is the limit to what we can spend tweeking these machines up. I can easily see where $25,000 could go into an RZR or Ranger.
Around here where I am most of that would be a complete waste that would also slow you down or keep you off certain trails. We have plenty of trails that a stock RZR can go but a Ranger is too wide for and even some guys who got big foot kits for their quads can't make it through.
I do like reading about these kits and seeing some of the machines dolled up. Guess it is all about what you can do and where you can ride it.
Gary