At the minute we (The Community Team) are trying to limit/cut down on the number of stickies (you've probably noticed a few stickies being removed and left as normal threads over the last few months).
The reason behind this is because a lot of stickies aren't used as much as intended, and therefore if a thread is unstickied but still used a lot then it will keep itself bumped. I think this is the case of the threads you are talking about - if a lot of people or enough people use it for it warranted to be stickied, then it will keep itself bumped and there isn't a need for it to be permenetly stickied at the top of the page.
If you have to scroll through pages to find it, it would suggest that there isn't a lot of people using it so there is no need for it to be stickied as it would just be using up the first page and possibly making other [more serious?] threads to be knocked off the page.
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