[Illuminated One]

I really don't see your point(s).
Yes, actually modding things in is more productive and harder to do than just having ideas. So? There is no need for being productive here, everything said or done on this forum is just for fun (or at least it should be). If someone steps up to do anything that he or someone else proposed that's nice, but in no way compulsory. Neither is it neccessary to know what cannot be done (besides that's a relative term).
If the thread somehow annoys you just don't read it (and I don't buy it that the 99 unimplementable ideas hinder you implementing a good one, when you make pretty clear that you wouldn't dare think of ever doing something that came up on threads like this). If it is against forum rules the mods can close it. Problem solved.

Besides I don't view all of these ideas as just some hints about what should be implemented into dom. They might start a train of thought going somewhere else, or show preferences, point out problems, etc (which might be useful if someone else would be making his own game). And yes, even in that context 99% are useless - but then, it's everyone's own decision if he tries to make something out of it.