1. Why we all agree on this forum fiat money has no intrinsic value, virtually all economists believe fiat money has value because it is backed by a government. The US dollar is the petrodollar, and is essentially the reserve currency of the world because oil is bought and sold in US dollars. This is coming to an end. You can knock fiat currency as worthless or suggest they only have value at the barrel of a gun, but the fact remains fiat has value because the market assigns to them value.
There is a difference between intrinsic value and utility. Fiat money does indeed have utility because it is the required form of payment of taxes. Try paying your taxes with anything other than fiat and see what happens. That's a significant utility since it keeps you out of prison.
2. If Bitcoin has no value because it is only bought to be dumped to the next guy, please explain the following:
2a. Why do some people buy Bitcoin and store it, instead of dumping?
2b. If exchangers sell bitcoins for fiat money, because bitcoin is worthless for anything other than dumping, why do these exchangers store thousands and thousands of coins in their wallets and valuts? Why are they buying bitcoins and saving them?
Everybody that is speculating on bitcoin holds it for the same reason - greed. Why sell at $900 if I think I can hold just a bit longer till it hits $1,000, or $1,200 or maybe even $10,000.
2c. If dumping bitcoins on the next guy is the only reason to buy bitcoins in the first place, and this is a sign that bitcoin has no value, then why do people speculate on precious metals, only to dump them for fiat currency? By your argument, dumping something on others makes is valueless. And yet, precious metals markets are full of the same exact speculation of pumping and dumping and saving.
Precious metals like gold and silver have an economic utility, so there will always be underlying value beneath and speculatory price. If you read something like Security Analysis or Intelligent Investor by Benjamin Graham (Warren Buffets mentor) you'll see they do a good job of explaining the difference between price and value, and how the markets will often have the price of something wrong in relation to its actual value. When something is underpriced (the price is less than the underlying value, you should buy). When something is overpriced, you should sell. However, you will never be able to successfully time the markets so it's wise to avoid speculating.
2d, Why would anyone buy precious metals with intrinsic value and then sell them for worthless fiat currency? Do they have a clue? Or is it because the market assigns to fiat currencies a certain value and gold and silver needs to be liquidated in order to be used?
Again, fiat currency is the only accepted method of paying your taxes and if you don't pay your taxes guys with guns will try to take you away. There is a lot of value in that.