Not free, but a commercial proposition for users of a machine that is already replaced by the Helix.
Without underestimating the qualities of the 500X, I think that if people like me put their money in this product, one of the reasons is that they can't afford the Helix.
So keeping a high price for model pack ( and after make a free deal for lucky users) isn't productive. Having something between 10% or 30% discount could increase the sells of addtionnal model pack.
No more, no less
PS sorry for my english, not a native speaker.