yeah,i once saw a saltwater fish for 300 dollars
I recently saw a 3" Volitan Lionfish selling for $199.00 at the local Petland. They also had a Blue Hepatus for $129.00. I do not buy my fish from there as obviously they are ridiculous in they're prices. But they have under-qualified staff, especially the 'manager' and the tanks are horrible!! Truly embarrassing if i were them. I do like to look when getting dog treats there.. it's a bitter-sweet pleasure.
I guess my point is $$$$ isn't always relative. However, it's a safe bet that saltwater fish will ALWAYS be a bigger investment then freshwater. After all a freshwater hobbyist can, if chose too, walk into the LFS
and buy Neons 3 for $5, some Mollies, Angels and maybe a Pleco, and have a tank full of fish for maybe a $50 - $75 investment.. Saltwater will get you 1 fish and a couple of crabs, snails and maybe a choco starfish.
I am minimizing the scenario just to make a point.