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Bitcoin goes up, altcoins go up. Bitcoin goes down, altcoins go down. It's not that weird either with BTC being almost half of the market cap. Profits go into altcoins to make a quick profit, then back into BTC. There definitly is a clear relationship here...

It's not that clear. I've seen it do the opposite of what you described as well. I've seen both go up and down together (thanks to things like Tether) and I've seen them move opposite to each other.