guinea pig director

noun1

1. •
   (informal, old-fashioned) A company director (usually one holding a number of directorships) who serves merely or mainly for the fee (in England, often a guinea) paid for attendance.

   • We wish all men were equally conscientious, and we should get rid of that useless animal, the guinea-pig Director—a greater abomination to good management than which does not exist. — 1858