Guys I completely understand that you have to defend your spending of $100k+ otherwise you would look silly. And I don't mean any disrespect here
100,000$? it leans towards 200,000$-300,000$ actually when you factor in all the D/D, then other parties in the application...
Is it worth spending that?
Depends really, it's not a lot of money when you consider the return on investment, whether that's tax structuring, or whether thats a safety net.
Factoring in if you will, in the UK currently its near on impossible to pull physical funds from a bank account, in the US its near on impossible to pull funds out of Coinbase (5k limit introduced), etc you can clearly see there's a capital control stopping assets moving out of the system as it begins to implode... now factoring in if you were a British national resident you established an account overseas, it doesn't take much to seize that account in the name of the country in the time of economic collapse (socialised losses), that second citizenship would/could/should have opened opportunities to new stores of wealth...
You could of-course go another route to obtain the same objectives, ergo live in a country, obtain residence, then citizenship, only issue there i see is that most of these countries either have territorial taxation, or world wide income taxation, or perhaps some day will introduce such.
Overseas island commonly known as 'tax havens' with citizenship by donation/investment etc won't go that way because their entire system is built on harbouring wealth, high-end tourism, and low tax citizenship...
So 300k for that ?
Chump Change.