Pay Raise VS. Bonus Program

Our GM has just installed a bonus program for the techs and writers. My bonus is directly affected by what the techs get. The only way for me to get a decent amount is if ALL of the techs make their bonus. It's a great program, dont get me wrong, but its also time for a yearly pay increase and I have been informed by the GM that the bonus program voids out any pay raises. Is this fair? A bonus program should be over and above a regular yearly pay increase. So basically by accepting the bonus program, us writers will never get a pay raise. And how long to you think it will take for the bonus to fall by the wayside?
Thanks for listening guys!!
Thanks for listening guys!!