CageFree

I recently went through the same process. I sold off half of my stack and went for a vaulted possition at 1.5%. my plan is to buy back when premiums drop or quickly liquidate if the £100 per Oz comes in as promised by 90% of YouTubers. It was also good experience of selling. No use collecting all these shiny bits if you can't sell them.

It is because platinum is subject to VAT and gold is not in the UK so it is easier to deal with gold as you don't have to deal with HMRC that will find any old excuse to tax you anyway.

Can you get platinum coins that have a face value?, I've taken gold coins overseas before and I declare the £100 face value rather than the intrinsic value.  You are perfectly within your rights to do this.

Well that's just it, your last sentence is the answer to your question. Yes, I do live in the states and yes the ASE is the preferred coin here, so what premium do you put on that vs exactly the same item just from a mint of a different country?! 50cents? $1? I was ok with the small premiums for ASEs when i first bought my ASEs. But today, that premium is $10!!! And you said this yourself:
".at the end of the day there will always be people to buy any coin from any country.."
So as metallica73 put it, why would I not trade in my ASEs for a significantly larger number of foreign minted 1oz silver, if the current ASE market seem so badly distorted?! Over the long term, I see those ASE premiums coming back down to the historic norms. There will not be a shortage of ASEs for ever. 
 

My brain says if you can offload the eagle, buy an oz of something else and pocket a good few $ whilst at it then go for it!
It all melts down the same...

Honestly think if I was in the US and had stacked a decent quantity of ASE's now would be the time to offload them. You could probably turn 500oz's into 550oz by buying Brits or Phils.

Why on earth are the 2021 1 oz silver eagles $37 dollars, while 2021 philharmonics or britannias are $27 at that same dealer? Why is the market willing to pay up so much for an eagle vs the rest of of the group? I am a total loss to understand the pricing dynamics here, because in either case it's just a 1oz silver government minted coin, so what gives?!