Wouldn't that incentivize farming ECR off of hundred or thousands of accounts? I believe you don't even need to buy a spellbook to have ECR. But even if you need to make a one-time 7$ purchase (since 3$ is returned as credits) per account, it may be worth it, if one wants to farm ECR "professionally". I don't think this idea would work, tbh. Too much downside.
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