I'm a bit new to the marine side of things, but frankly I haven't seen anything that suggests marine aquarists, as a group, are any different from freshwater aquarists or cat or dog owners, for that matter - there are the good and bad, and the plain stooopid.
I've got a pretty modest set-up containing some pretty expensive corals and I do do my best to keep them happy (which can be measured in dollars - I estimate it costs me about $50-$80/week), but I've seen some pretty impressive equipment owned by complete bone-heads housing a few sad survivors.
I'd agree with reef in that money plays a role - unless you are willing and able to pay the startup, stocking, and RUNNING COSTS of your set-up, both in terms of cash and time, you won't be successful and should leave rarer and harder corals alone, but as price-points are relative to income, its always going to be a pretty blunt and ineffective tool for keeping 'dodgy' keepers away from certain corals. I'm lucky (stoopid?) enough to be able to buy expensive corals, but I wouldn't say that it makes be a better keeper.
Ultimately I think it turns on your own concience, not money. I do care about my corals, which is why I'm happy to spend money on what they need to survive and hopefully thrive, but how do you convince some lunk with dollars to spend that he shouldn't buy that coral because he doesn't care enough?