and they will continue with golden for sure
What do you base that on? From what I can tell this is a bonus outside of the game itself that they offer for that tier.
their next tier targets will be platinum and diamon ofc
Again, baseless. It would be a really dumb move to make things exclusive to those tiers, because of how expensive they are. If they do, they will get backlash. Besides, the diamond tier is already sold out.
i see no difference between iron bronze and silver
You haven't been paying attention. And you can even read what the differences are on the Patreon page. Bronze gets cheats, and silver gets extra scenes and CG on top of that.
i suppose golden is same style
Again, you can actually read what the gold tier is getting compared to the other tiers. It's test builds and the high frame rate animations.
Why do you ask if it's worth it if you were already under the impression that there was no difference between the tiers that are already there!? Wouldn't it make logical sense then that the platinum and diamond tiers have nothing different either? Of course that wouldn't be the case, but then we're back to my previous reason on why you more than likely won't get an answer here. There is no one here that is of that Patreon tier, and even if someone was, they wouldn't be able to tell you if those updates you made up are worth it, because they don't exist.