That's important thinking (:
You remind me of last month's competition, I managed to increase my balance from $200 to around $3500, at that time I only needed closing for the Bonus Buy competition, but as a result, my balance dropped to around $1000. I shouldn't be hunting for Buy Bonuses, logically I've already made a profit, I burned around $2000 just for a $300 reward LOL
Experienced the same thing few months ago, lost what I won because forced myself to hunt entry for buy bonus contest. It was stupid mistake obviously as the reward from the contest is not even 25% of what I lost lol. I did even do buy bonus with bigger amount than the main reward from the contest

Regret it for sure at the end of the session but expensive lesson learned and life must go on.