I feel like stickies should be for things that need to be seen over a long period of time and are always relevant. For example, the noobs guide to ns rarely gets posted in but needs to be readily visible to new (and some older) members. Similarily, 'How to ask for ski advice' should be readily visible in gear advice because it provides a lot of important info that hopefully cuts down on the crap in gear talk. If these things were to fall into the depths of NS it would be a problem.
Things like the recovery video may be important at the moment but has a very limited lifetime. If people care about it, it will continue getting posted in and will stay near the top. If it is falling to the bottom of the forum it is likely because people have seen it and lost interest/moved on.
Same with the sticky about the olympics - if people feel like discussing the olympics they will post in the thread and it will continually get bumped to the top. If it matters, it doesn't need to be stickied. If people aren't posting in it and bumping it to the top, why does it need to be seen? Having it stickied may in fact decrease responses because people will read it once and then scroll past it. If it is continually moving amongst the normal threads, people will recognize this activity and go back to read the new responses.