The potential system and selling your stuff/merchanting

Sometimes way more than a few million.
It's almost difficult to overestimate what some are willing to pay for some categories of stuff.

I sold a 3-line 3% INT lvl100 mage overall for 50M.
Also a +60 Accuracy lvl 100 warrior top for 50M. Sold very fast. Probably should have asked for 100M or more.

On the other hand nobody wants my 3-line lvl 100 pirate boots even at 1M.

At above:
I only sell revealed items. When I'm training, I pickup so much stuff I can only keep things that are 3-line and have job-appropriate stats and have to drop the rest.
I doubt that the 120-level glass has any better chance at finding 3-line. Just a waste of mesos.

So I see that the really high level items go for mega mesos. If you can afford to cube that is. Unfortunately, I don't have a character above 50 to hunt in those areas. Thanks for the advice on the magnifying glass.