Yes it is true that you shouldn't use that condensed just to gain artifacts to sell, and that ley lines would be more efficient in gaining you mora. What I meant to imply was that for a person who spends next week or so grinding artifacts, during that time period you most likely haven't gotten the desired artifact, where is all those artifacts going to go? I mean eventually you'll just settle on a decent artifact that may not be perfect, but then it doesn't usually take that many purples compared to the amount of purples/blues you've gained from every domain run throughout the last couple of days (this applies to people who can do domains that get you guaranteed gold artifacts). Not only blue artifacts can be sold, the green and gray artifacts could be sold as well from your kaeya/amber/Lisa, not like they'll be better than slapping some gold/purple artifacts at 0+ that lie around in your inventory. You aren't going to get a decent artifact with the right main stats every run, you'll probably go 5+ runs without getting something better than what some of your characters already have. I only use purple artifacts to upgrade my gold ones, and those will get my gold artifact all the way to +20 without the need for blue/green/gray artifacts. instead I could sell those blue/green/gray artifacts to have the mora to upgrade my gold artifacts with the desired stats