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Amount paid in taxes compared to net worth isn't a useful metric to determine whether you're overdoing it with multicoin, unless it's like, equal to your net worth or higher.
To illustrate what I mean: let's say someone with 10 million in liquid (and total net worth) invests in a coin 10k coin 1x for 100 cycles and his total net worth goes to 12m the next day when the coin goes to 20k, at which point he sells it 1x. Nice. He paid 45k in taxes.
Now, a different trader with 10 million in liquid invests in the same 10k coin 5x for 144 cycles, and thus his net worth goes to He paid 1.62m in taxes for buying. His net worth goes to 15.58m the next day, and he sells that coin 5x to materialize his profits, and at the end of the day he's left with 14.04m in his account. In total, he paid 3.78m in taxes, but earned 4.04m.
Now, this is a very simplified example that completely ignores changing prices throughout the day, and it's woefully unoptimized on both traders' sides... but if you has asked me if I'd want to make 4.04m profit or 1.955m profit, I'd choose the former... even if it means I'd pay 84x more taxes.
That being said, for newhags there generally are better trades than a higher multicoin of a single coin, so they should utilize 1x buy/1x sell as much as possible as a general rule.