Shiva has always been crowded, I just think that people are realizing that camping the Spook is easier than other NMs due to the accused bots/gil sellers/everything else that seems to create a new topic every day. I also think that people realize that Spook spawns are regular, so no guessing, its not a random pop, so no more running around killing everything in sight to get an NM to pop, and the Spook's drop rate seems to be a lot higher than most other high priced drops. However, I've found that camping Spook is about as profitable as farming Tigers, but that is just my experience however.