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Re:How I Busted a Thief Who Tried to Sell My Camera on Craig... by brass9 on Sunday April 07, 2013 @10:14AM (#5507260)
$17,000 figure is correct:

1) Store buys TV (COGS = $7K): -$7K

2) Sold TV for $10K. Realized P/L: $3K

3) $10K refunded (chargeback): -$7K

4) TV is gone as well. Inventory: -$7K

5) Potential profit loss: -$3K

Total loss: (7+7+3) = $17K

Re:How I Busted a Thief Who Tried to Sell My Camera on Craig... by sokoloff on Sunday April 07, 2013 @10:25AM (#5507286)
1. Store buys TV. -$7000

2. Store sells TV. +$10000, subtotal: +$3000

3. Store pays chargeback. -$10000' subtotal: -$7000

You can't double count the TV, and IMO, you can't count the potential profit loss either, as that's covered once the store buys a replacement TV for inventory. There are fees on top of the above, but the store is out the COGS and fees, not double the COGS, plus the margin.