Usually you place an auction with an auto-buy, it gets snatched up right away, and you end up finding out you wayyyy undersold your dragon/item (or always wondering if you did)

Better to leave an action without an autobuy unless you're certain of the value of the dragon/item and the autobuy is well above that.

Congrats, nonny. You did well and those 11k gems will be very useful. Just don't waste them all! Make sure to spend some to ensure more gems in the future (invest before the next reg period, yo)