I think you've answered your own question. Unless you can find someone interested in purchasing a fake that's been made to cheat, swindle, deceive, snooker, whatever - it's worth zero except as a curiosity.
The card named 'Exodia the Dark Master' is a counterfeit card, and not worth anything.
It is a fake card, a counterfeit version of 'Harpie's Pet Dragon'. It is not worth anything.
It depends, many low quality counterfeit coins are simply made in lead and would be essentially worthless, but a few high-quality counterfeit coins are actually made out of silver and would be worth the silver value.
I think you pretty much answered the question by knowing that it's a counterfeit. Except for a few storied exceptions like the so-called "Racketeer nickels" of 1883, counterfeits are worth zip. A counterfeit is worth about 10 years as a guest of the federal government. A good replica, although not technically worth anything, will usually bring $10 - $20.
No, you don't have to paint anything on counterfeit island.
It wouldn't look like anything because no genuine Trade Dollars were minted in 1872. If you have a coin with that date it's a counterfeit. There were some silver pattern coins dated 1872 that were struck in 1873, but these are already accounted for. They are versions of the Liberty Seated Dollar. You can see pictures of genuine Trade Dollars at www.coinfacts.com
Not a thing, not even water.
A couple of years in a Federal penitentiary.
The intention is to make the coin worth more. See the related link to spot a counterfeit coin.
It is a fake without a doubt. Trade dollars were not struck until 1873, any trade dollar bearing the date of 1872 is a counterfeit.There are numerous iron (magnetic) fakes made of the 1872 dollar, which copied the genuine "pattern coins" struck in 1873 but dated 1872, of which 6 are known.
The first Trade Dollars were minted in 1873. If your coin says Trade Dollar on the back and is dated 1872 it is a counterfeit. If it does not say Trade Dollar, then it could be a genuine Liberty Seated dollar. You should have it inspected by a dealer or certification agency because its value could range from $300 to $1000 depending on condition.
Its probably only worth its weight in silver. As long as it is not sold as being real and is clearly sold as a replica or example of a counterfeit item, it is legal to sell.