About your question why he didn't generate x coins for himself: he could have done a hefty premine, but since btc is open source, everybody would have been able to see the premine right there in his sourcecode...
Just a sidenote :
What's the difference between a premine, an instamine, and Bitcoin ?
Since that cryptocurrency scheme was coming out of nowhere, satoshi was the only one believing in it for some time, and was the only miner.
Fact that it was open source is important, but to me bitcoin is an "instamined" coin. The "Insta" part during weeks, sure, but still ...