The site also offers an incentive based service, similar to Threadless in which users can submit their own t-shirt designs for consideration to be sold.
Hanigan can earn up to $800K in incentives based on playing time, split for the 2012 and 2013 seasons.
But incentives based on playing time and performance could earn him close to $1 million.
With incentives based on the number of starts he makes, Hershiser could earn another $500,000 this year.
The Yankees would prefer to sign Williams for $1.5 million to $2 million, plus incentives based on playing time.
FM instructors are also eligible for incentives based on cash collection.
The 30-year-old Horn could also earn up to $150,000 in incentives, based on plate appearances.
This gave him a $1.25 million base salary, with up to $3 million total in incentives based on games pitched.
The final contract was incentive based, if Hampton played he got paid, if an injury forced him to the sidelines we would not.
In October 2007, Ausmus accepted a one-year, $2 million (plus incentives based on playing time) contract.