I loved watching David Price pitch for the Toronto Blue Jays in last year’s pennant race, so I was sad to see him sign a seven year, $217 million contract with The Boston Red Sox a few weeks back.

Of course, it wasn’t Price himself sitting across the negotiating table from the Red Sox brass. He was represented by his agent, Bo McKinnis. Price—like just about every high stakes professional athlete—has an agent in his corner because there are just too many things that can go wrong, too many egos with the potential to be bruised, and too many zeroes at stake to negotiate on your own behalf.

The same is true when you sell your business. When there are more zeroes involved than selling a home, you need someone representing your best interests. That’s a lesson Alexis Martin Neely found out the hard way when she tried to sell her company on her own. What started out as a promising relationship with a buyer ended up as a DIY disaster.