Either to raise awareness or to boost post count.
No need to be surprised to see old threads are bumped by someone with stake's signature. I'm sure there is no other reasons except about their contest to post on the first page of gambling thread. I have reported all those kind of bumping old thread including this thread. Most of them has been deleted already, maybe this one will be deleted soon.
..it seems that someone is bumping an old thread trying to give gain the first page post which is not the right thing to do..it seems that it is more efficient to do posting a new thread than bumping old threads..
You know about it, but you reply on it instead of reporting it? Funny!!!
If you see an old thread is bumped, use the "report to moderator" feature. Dont reply it.