why cannot I tag one of my answers as answering my own question?

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Actually I just had the same problem and wanted to add a new thread about this. As it is not olimpic games we're having here, I think the risk of people actually trying to boost their karma by creating artificial questions is really low. I think no one sane would risk his/her reputation to do that. Stack overflow allows accepting your own questions after 24 hours, I think this is good enough.

I've just posted an answer to my own question, and would like to close the case so nobody else wastes her/his time to read my question. I'm not expecting any karma for that. Isn't there an option to not add karma for marking your own question right?

Regards, Tom.

I think the idea is you want one outside source to confirm the answer. I had a similar circumstance a day ago, and someone else came in and checked the "answer" to my own answer to the problem.

Looking at it a little differently from a security perspective. You want to prevent someone from artificially "answering" all his questions and boost his karma. Since this is a self-moderated site, you want to prevent some lone guy from reeking havoc by editing/deleting comments since that's an ability you get once you've earned a high enough karma. Obviously, you don't want just anybody to have this power.

-Shark