I posted the "responsive" question and answer. I don't think there is harm in it (obviously, or I wouldn't have posted it) but I'm not sure it was the correct course of action. We probably don't want to promote this kind of activity, but it feels unnecessarily punitive to permanently remove or close the on-topic question that came as a result of the situation.
Were my question to be viewed in a vacuum, it'd be considered on-topic. This is a strange case. On one hand, most product ID questions will not be self-answered because if you know the product you have no reason to ask the community, and self-answering that sort of question does seem, in some ways, like a point-grab. But then there's a problem. We can't disallow self-answering (because that goes against the nature of the site), yet we don't want to encourage that type of behavior because what is to stop every Shmoe from self-answering product-identification questions to farm rep?
To directly answer SSD's questions:
This is an obvious gaming of the policy that we don't answer recommendation question. But does it avoid the problems, and so make it ok?
I think it does avoid the problems of game-rec in this very specific scenario. Game-rec is problematic because there is no "best" answer to a "what game should I play if I like X?" question.
This probably doesn't work if someone asks, "I like dungeons. What should I play?" And I'd be shocked if someone did ask this and it resulted in 300 different self-answered questions from people trying to help regarding every different dungeon-based P&P RPG out there.
I Q&A'd as I did because I know of only one licensed DBZ game that exists -- aside from the original print and it's sequel, there is a fan-made update of the same game, and there are probably some open-setting systems that could adapt fairly well. Other than that, nothing exists. It's a very small edge-case where this type of response even works.
Could it have unintended problems of its own?
I don't think so, given the above. It's a pretty specific scenario where I knew there could be a single "best" answer to a game-rec/does it exist? type question, and I managed to answer it in a way that isn't off-topic (though it has obviously created some contention here).
Is this something we want to see more of?
Probably not, but again this is a pretty specific case that is not likely to come up again.
My vote (and sure, I'm biased) is to keep the self-answered question (because it is on-topic and doesn't violate site policies) but not promote this type of behavior going forward. Again, I think it's a pretty specific case without much (if any) harm done, with honest intentions (to help a new user find an answer in an on-topic way), and which resulted in a bit of a kerfuffle. I don't think there's much opportunity for this type of thing to happen going forward (has it been a problem since game-rec was made off-topic?), but it's too early to tell if this is going to a bigger problem than what it is now. If we do start seeing more of this type of behavior then we should work as a community to address the problem but as it stands, I see no reason to worry until it becomes a bigger issue.
