because they want to who the fuck wants to read through 1000 posts anyway..I can even stand reading more than 20...which is why I didnt even read anuthinhg more than this page in this thread
its pretty much for no other reason than the mod thinking it'd be best to start a new thread at that time some go well above 1k...some don't make it that far past it...some don't even make it close (say a few hundred off)