The dealer is incorrect that it has to be dealer serviced to be warrantied. There are right to repair laws in the US, but the burden of proof is on the owner and the dealer/manufacturer can be a real PITA about it.
However, the fact that a dealer is saying this is a major broken promise. The whole premise of the Grenadier was that it would have an open source repair manual to be repaired anywhere. What the dealer is pushing is just as egregious as Land Rover and probably worse since Ineos said before the launch the complete and total opposite that it would be a user serviceable vehicle without proprietary nonsense to service.
Perhaps I am mistaken and only warranty repairs can be completed at a dealer, but even in that case, no thanks. What happens when something breaks 1,000 miles away from an Ineos dealership and it can't be warrantied? Completely defeats the purpose of a built for purpose enthusiast owned vehicle.
I gripe about the cost and will continue to gripe about the cost. The idea that an LC200 or a 4Runner or even a VW can't be driven off the lot to the north slope of Alaska without tens of thousands of dollars in modifications but a Grenadier somehow can is not accurate. How did all of the clunkers on the north slope get up there in the first place? It wasn't teleportation. They drove. My high school math teacher drove a 1964 Series II Land Rover bone stock from Maine to the northernmost part of Alaska and then completed the Pan America nearly 30 years ago when that trip was far more rugged than today. It was slow and uncomfortable, but he made it. People do it in VWs. A Rolls Royce made it from Cape Town to London. Maybe they didn't do all of the side trails, but $80-90k is absolutely not needed to go have a fantastic adventure in the arctic.
I may still buy a Grenadier because I'm too tall to be comfortable in a 4Runner and I think LC200s are also absurdly overpriced, but let's be honest. The Grenadier is a wealthy man's toy conceived and brought to market by a wealthy man who wanted a toy. That's not inherently bad, but like ANY vehicle, its many pros are met with an equal number of cons. Pointing out the tradeoffs, of which cost is a really significant one, isn't out bounds. It's part of the discussion.