Someone told me that Arch is a good way to make money... is this true?

Given the ridiculous prices people charge ... and others are stupid enough to pay ... for archaeology mats, I'm guessing that if you are willing to do all the manual harvesting that it could be.

on my 50 assassin i would run around the dark temple and harvest all the arch mats, it was wonderful, no agro, doing that for about 45 minutes with circuits i was able to get a couple stacks of rubats and a stack of the artifacts, both sold for about 100k per stack. so yea it can be profitable, just work on gathering during the week and sell starting on fridays around mid afternoon