The game itself remains interesting because of the regular changes. Character advancement remains interesting because you need to adapt to new changes, and because you can always improve your equipment and buy more rares.
The community is probably the greatest attraction, with such a variety of people and opinions. I'd say that the worst part about the "end of camping" is that it has reduced the interaction between players - it was always fun to try to find a buyer for an item you camped, or to bargain with campers for a new item.