Kinda scared...deal too good?

I just sold a bag on eBay that was still on the website for less than half of what I paid. I didn't have a reserve (mistake). It was NWT, I should have just returned it. But I worry that if you return too much you will get flagged or not get PCE discounts. So, I just took the hit. Next time, I will use BIN with best offer instead of an auction.