'Cause they're gorgeous, lol.
All I've got is soft photosynthetic inverts and some rather convincing fake corals. I never did have great luck with acropora, despite how awesome I think they are.
I've always loved the way reefs tend to look,
but not so with how much they tend to cost and the work involved. It seems to me that even seasoned reef owners themselves can't decide whether owning a reef tank is alot of work or not. When someone pops in saying "Hey I'm starting a 10g reef RIGHT NOW with zero experience!" everyone says "Oh, it's alot of work, you'll have trouble keeping the water just right, it's expensive, etc." but when someone posts a thread specifically asking whether keeping a reef is difficult or not, the answer is: "Oh it's not that hard, the only difference is the cost and the salty water." I think that was a direct quote from a thread here, in fact, lol.
Personally, I love the authenticity of a real SW
reef and a sense of pride when things are going well; seeing my plain rocks and tiny frags grow into something gorgeous... However, the very instant some unknowing friend or relative comes in and can't tell the difference between my reef and my "freshie in disguise" tank, it feels like a house just fell ontop of me and crushed me, and that I wasted hundreds of dollars on something I replicated in a week with fake corals, some from walmart. However, because I
know the difference, and I can easily see how much more ALIVE my reef is, I keep going. And it always feels good when someone who has a clue walks in and says "WOW that's an awesome fish tank!"
If you're someone considering starting a reef, I have a few bits of advice fresh in my mind, as I am not seasoned at all:
Get the biggest tank you can,
Cycle it patiently,
START SLOW when stocking.
Really, that applies to any tank, but IMO
even more so with a reef. It can be a nearly independant ecosystem when done properly, but it can be fragile and delicate in the beginning stages. Start with the easy stuff first, and progress cautiously.