Artifact Shops Value Calculation
2-star artifact gives = 840 exp
3̶ ̶s̶h̶o̶p̶s̶ ̶=̶ ̶3̶ ̶x̶ ̶5̶ ̶=̶ ̶1̶5̶ ̶x̶ ̶8̶4̶0̶ ̶=̶ ̶1̶2̶,̶6̶0̶0̶ ̶e̶x̶p̶ (old)
1̶5̶ ̶x̶ ̶2̶,̶0̶0̶0̶ ̶m̶o̶r̶a̶ ̶=̶ ̶3̶0̶,̶0̶0̶0̶ ̶m̶o̶r̶a̶
4 shops = 4 x 5 = 20 x 840 = 16,800 exp 🆕
20 x 2,000 mora = 40,000 mora
At WL8, 20 resin gives you 60,000 mora via leyline
20 resin can also give you a minimum of 12,600 exp from an artifact domain.
Through mora, you can receive more exp.
In conclusion, buying from shops is efficient, if you are in need of fodder.
Remember: Just don't resell them
*Locations: https://genshin-impact.fandom.com/wiki/Shops#Artifacts
*Feel free to let me know if any of my calculation is off 
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