Yes, but not big enough variance to buy for resell Imo. Usually weekends have more players on, and more people trying to undercut each other. Things like demand (like pet usable scrolls) and supply (ie some xfers back to atl with a lot of scrolls) can swing prices. Usually too risky for investment and resell since you may end up losing gold. I usually check a few PS daily to make sure no one way undercut.
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