I couldn't bear the strain of this.
When one of my $1.20 Neon Tetras goes belly up, it's a bit easier to take.
There is no doubt that freshwater tanks can be beautiful, especially some CO2 driven planted displays. That said, the incredible diversity of critters that can be housed in a saltwater tank is simply unmatched by freshwater. And really, you don't have to spend that much on fish. A pair of tank bred ocellaris clowns might cost you $20. A trio of anthias might be $45. It's not that bad, but yes, definitely more expensive. But it's not just the fish. It's clams, shrimp, crabs, feather duster worms, starfish, corals, anemones, and the absolutely incredible amount of random critters that live in and on the live rock.
That said, the livestock isn't even my favorite part about saltwater. It's how involved it is. Certainly you can make a freshwater tank quite complicated, but it just can't match saltwater. All the equipment and testing working in tandem to keep certain parameters at certain levels, dialing in lighting for the specific kinds of corals or anemones you have, dialing in the proper amount of flow, understanding the relationship between calcium, alkalinity and magnesium and how those three contribute to coral growth, understanding the effects of pH, of micronutrients on the livestock, the list really goes on. Take a gander at the this article, for instance. I find this so fascinating:
http://www.advancedaquarist.com/2002/5/chemistry
or this:
http://reefkeeping.com/issues/2006-06/rhf/
And then there is everything I've learned about plumbing, carpentry, electrical that was necessary to really mold a system to fit my exact needs. The amount of tinkering that can be done is never ending. There are always new ideas, new equipment, new possibilities. It's definitely the kind of thing that isn't finished once you have livestock in the tank, and that's what I love. I can constantly learn something new. It's not for everyone, but for me, it's like a drug.