Your experience matches most closely to mine. I started on SO early in their existence and got plenty of points answering easy PHP and jQuery type questions.

As my career progressed I took on deep problems with complex issues and complex answers. Not much sense in asking as no one ever managed to help me with them. I’d just end up answering my own question a week or a month later perhaps.

And of course the moderation and karma farming - I oh so ‘fondly’ remember the one user that would take your question and run some auto-formatter on it so that it would fit his personal style guide and then get a percentage of the points as your now “co-author.” What fun!