Yes, 81 micrograms sounds small, however you're not accounting for the gold that will be mined between now and the time satoshis reach 2.1 quadrillion. I trended the last century's growth and extended it to 2140 and it's 2.22 times today's total above ground amount.
That takes your 81 micrograms to 178 micrograms. However, another way to look at it is 1/6th of a penny per satoshi in terms of gold supply. Or, 1/10th of a gram of gold at today's rigged prices equals 393 pennies or 560 satoshis. What's so different? It's all relative. :)
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