Even though I know that SIA loves these threads, the ones where we congratulate folks for hitting milestones in their posting, I suggest that there is one sticky thread in the clubhouse where these threads are located.
I may be wrong, but I think what you really want to see is a child board
that contains all the congratulatory threads, much like the "PP.O Who are they really" child board & not a sticky thread.
A sticky thread is one single thread, whereas a child board is like a sub-forum that contains all relevant threads.
I think the way you have it worded is confusing the fuck out of a lot of people. They might be looking at it as if you are suggesting that there be one single thread that people get congratulated in or a single post within that thread gets entered with the milestone on it. I don't think that is what you are suggesting.
I think there is nothing wrong with adding a child board to put them all into, in fact I think it's a damn fine idea.
Hell, we have a child board for the "Who are they really?" threads & there's a lot less of them than there is congratulatory threads, so why not?