Years ago, there wasn't a Codes and Rates subforum on the Resorts board. Members would come to this board instead of the TPAS to find out how to upgrade tickets or where to buy them for less than the gate price. Car rental discounts became the domain of the Transportation board, instead of the Budget board. There were more discounts: remember the Magic Key Club?
AAA discounts? Length of Stay passes?
So what was left for a fractured Budget board that had the heart carved out of it? All the "stuff" that none of the other board moderators wanted to deal with...fridge swaps, stroller swaps, Photopass shares and threads on how to eat cheap in Disney. And once the swaps and shares died off, it left very little for this board to cover that wasn't being discussed elsewhere on this forum. So the board reinvented itself and evolved into community it has become.
Now, you can complain about all of the "off topic" threads that you think you see on here. But the truth is that if you moved all of those "off topic" discussions to the Community board, you would also have to move threads about room discounts to the Resorts board, discussions about tickets should go over to the TPAS, posts about CC rewards should be moved to the Rewards board, and so on. In the end, you would end up with no discussion on the Budget board at all and just a bunch of redirects to other boards. And in the process, the webmasters would lose a loyal following on one of their busier boards.