That many games seem to differentiate between so many types of Elves? We now have Sea Elves, High Elves, Aquatic Elves, Dark Elves, Wood Elves, Desert Elves, Tundra Elves, and plenty of others as well. It becomes predictable--an Elf that dwells in the Jungle, one that dwells in the Badlands. One that lives by Rivers, one that lives by Trash Heaps.
Sure, there's lots of various human cultures, too, but those are generally presented as cultures, not whole new races. You see this with Dwarves as well, but not, I think, to the extent as with Elves.
So what is it that makes us have these multiple races for Elves? Where did the split begin? Sure, Prof. Tolkien had various branches of Elves, but not with that sort of presentation. Are they really that popular? I'd always though that a pretty good backlash against Elves was still going on, but that could just be personal experience.