".....you agree not to accept the positions"
But this makes no sense.
Are you suggesting that you agree not to accept the position on behalf of somebody else? Because that somebody else has already offered to "accept the position" otherwise there would be no takers for the SIN base.
Therefore are you denying somebody else (someone you probably dont know) the right to make their own decision?
How would you feel if that decision was being made on your behalf?