It's not really about whether or not some games are serious and some games are not (and, BTW, I have to disagree with Padma, and would argue that such games are more beneficial to the site that a lot of other things, due to the players they draw in from other forums (or more to the point, from another forum), and as such can hardly constitute spam. Amongst other arguments.). It's about players of those games getting their PM privileges, which, by current rules, requires them to have a post count of 5.
Now if the forum is split (which I am in favour of), then the spammish elements of those games which would gain post count may be curtailed, and it's impossible to deny that there is a fair bit of spam in such games, even if the games themselves and the majority of posts within those games do not constitute spam. I would personally much rather have the privilege of being allowed to have spam in those games, than be forced to do away with those spam posts for the sake of post count. Because we can't really have those spam posts and post count at the same time. So I think that's an issue to consider; would we still be allowed to have spam posts within the game threads (although the games themselves and those posts contributing to the games are not spam) if post count was allowed? I think not.
However, that stills leaves the two main initial problems of PM privileges for players with low post count, and the lack of differentiation between pure spam games and games that require much more effort, thought, community-building and actual discussion.
The first of these problems can be partially solved by a forum split, although not entirely, because players would still need to wait until they have accumulated 5 posts within the game, and have been registered for 5 days, before they could received PMs. But a forum split would partially solve this problem. There are other solutions, though. Change the new rule on PM privileges, give Methos the specific admin privilege of allowing PMs, so that the other admins don't have to venture into the cesspool of spam that Forum Games apparently is in order to find those who have posted in the Lost PMs thread, and activate their PM privileges, or allow new posters to post five actual spam posts in forums that do have post count on (although this would go against the current rules of no spam).
With any of the aforementioned possible solutions other than splitting the forum, however, the second of these problems still remains. So, if you want to kill two birds with one stone, or actually solve both perceived problems (and I would be quite interested to hear the opinion of other moderators and admins on whether or not the types of games in question constitute spam; not because I want to disregard Padma's opinion, but because I want to know if it is merely an opinion, or if it represents the thoughts of the staff and site as a whole), then the obvious solution is to split the forum. It solves both issues, not just one of them.
Honestly, I don't know how to reconcile allowing post count with still allowing that moderate level of spam within non-spam games, but surely that's not too much of an issue.