You know, I expect this mentality in the retailer-specific threads where there's a physical product that ends up getting hoarded. "No deals if you're not a regular in the thread" is a pretty common mentality and I've noticed over the years that deals in those get harder and harder to find, with nobody updating the main post, or intentionally waiting, because "if you follow the thread regularly you'll know anyway." For those who have obligations outside of CAG where they cannot follow a thread, parsing each individual thread for deals is a time-consuming task, time which can be better spent doing something productive or actually playing the games we've accumulated due to the amazing backlog-expanding nature of CAG.
However, for a situation like this, where the item in question is digital and unlimited, there is no reason for the cliquish, "be in our thread or don't get deals" behavior. No one's running out and hording Steam gifts of Portal 2 and depriving any thread regulars of getting a copy. The community, as a whole, is being helped. To cite the example above, where a niche game may be bumped off the front page by "too many X deal threads," let me emphasize the fact that this is a community and the basic essence of that - the needs of the many outweigh the needs of the few. If a thread is for something that many CAGs are interested in, it will be bumped, and more CAGs will see it. The community is being helped moreso than one Japanese game being bought by a dozen of us with several dozen CAGs miss out on a deal that's buried in a retailer-specific thread...and to play Devil's advocate, why wasn't that Japanese niche game deal posted in its specific thread where those interested in it would be able to find it?
And, really, as far as a new thread for every daily deal, who checks the Steam thread every day that isn't checking the team store for its deal? Steam is its own little niche culture in the gaming world with its own dedicated fanbase. Other people use it, but aren't die-hards - and posting individual threads for awesome deals is a great way for news of those deals to reach them. It is good for the CAG community, and, as it gets more people playing Steam games, good for the Steam community. Everybody wins.
Yes, those stating that this deal should have been in the Steam thread may have been polite, but it was an act that does not foster goodwill and results in a CAG that is fragmented and prevents the best deals from reaching the most users.
What I would love to see would be an improved tagging system, letting each OP simply check off common deal aspects as they begin threads, and adding a feature where one could create custom aggregate pages. Into Steam games? Add a box that lists all Steam-tagged topics as a pseudo-subforum on your UserCP. Got GameStop credit to burn? Add a GS-filtered feed to your page. Filter deals down to the consoles you own. The tagging system on CAG can use some improvement -- as evidenced by this thread for a Steam game with no tags.