So whenever you trade for something with Kronos you consider yourself to be paying $18 per krono? Whenever you sell an item for a krono or more you consider yourself making $18?
There's a difference between buying an FBSS for 3 kronos and considering that to be $54 and having just traded some GEB's that you won in a camp for 3 Krono and then trading that 3 Krono for the FBSS and realizing you simply traded one item for another.
It's one simple big giant fact: you can't magically turn a Krono into $18 or even $9, it requires effort, risk, time. What's so hard to get about that? It's degrees of separation. There are lots of real world examples of things that are at one point bought for x amount of dollars but do not = x amount of dollars.
Edit: Also my point was that people that go crazy when they see items for sale for kronos because they are so outraged that people would pay $50-100+ for an item are idiots.