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Not care with small money or not but I think most profitable investing on cryptocurrency than gold or silver, nowadays many people keep safety assets with gold or silver as investment way but not really brave investing on bitcoin or altcoin assets. Several of them worry with take risk and keep safety got return profit from gold and silver although few percent only every year, just have several person brave with higher risk and higher return by investing on cryptocurrency but depending with research firstly before investing on several altcoin.
I also feel that way, friend, if it wasn't for the capital to trade, it would affect the profit of each unit, even decimal for a profit. The bigger the profitable capital follows, for example 10% for money management to take profit, it's really logical than measuring capital later, if counting from the security of gold its physical appearance is visible to others and this can create opportunities, we must be vigilant to maintain safety.
but that doesn't mean that even in the internet world it is considered the safest, because there are no hidden loopholes and systems. However, if what you mention and its easy profit, cheap buy back at the moment, easy exchange and fast liquidity, I agree cryptocurrencies superior friend