How should I categorize eBay payouts, credit card payments, and other non-expense transactions in my "Expense Detail"?

Good question! There are two options:

1. For better bookkeeping, classify these as balance transfers. These transactions represent money moving from one account to another, so that's how they should be categorized. You can do this following these instructions: How to Record Balance Transfers – My Reseller Genie - Help Center.
2. If you want to keep things simple, you can also delete these transactions, but option 1 is easy and provides better results.