What2doNexon

Keeping the information secret is a lot easier than keeping the items contained. There's no benefit to a hacker telling people how to make a 300 stat item, but there is a benefit to one selling a created one, regardless of what his hacker buddies told him to do.

besides what blades said, remember two things, there are "teams" so to speak, they get in trouble with how each other does business, hell happens (example: deflation and undercutting of empress equips, they went down basically 1 bil in 2 days in scania)

other thing is that you are thinking short term, they probably deemed that they earn enough already, i presume they wanted to keep the items for future profit, say a new cygnus-like boss comes out, easier to hoard everything if they can kill from the get-go with overly powerful gear, and then dupe and whatnot.