I've read many of Satoshi's previous posts and writings, it's mind blowing how Satoshi was expecting bitcoin to come this far and he was prepared for it. Even in one of his posts he says he placed 8 decimals for upcoming decades... I've looked but couldn't find any info about what made him choose 21,000,000 as number of supply? Is there any logic/reason behind choosing that number? would love to know!
It seems to be just an arbitrary choice. He could have set any limit. I don't remember it being mentioned by anyone that he posted any reasons for it. It's just what he decided on, for reasons only he knows. Personally I would have like it to be 42M.
I would not have any problem had it been set to have the maximum of 100 Million Bitcoin...that would have been much better though of course we don't really know as to why Satoshi Nakamoto decided to fixed the supply at 21 Million. I am sure he can provide an explanation for this but since it would be impossible for us to contact the gifted guy then we will just leave it at that...am sure we can read some speculations on why this is so but all of those are just speculations and can not be verified. Right now, we can see that this limited supply against the increasing demand is one of the biggest factors why the price or value of Bitcoin surging by leaps and bounds.