Since you're such a hard-nosed sign, you're a great person to send to a bargaining table.
Whether you're negotiating a lease, your salary and benefits package, or just your daily lunch order, you're going to make sure you get what you want.
Those bargaining skills can also come in handy when it comes to your own business. Scoring discounts with vendors or just stumbling across some amazing vintage items for resale, you've got what it takes to gain the upper hand in negotiations.
Just make sure you're not so aggressive that you alienate everyone around you. No one likes a gloater.