Here is the way you need to look at it..... YOU are in 100% control. You asked if you can ask for reimbursement..... Don't ASK.... tell them this is how it's going to be. You don't have to be a dick about it, be nice and explain how it WILL be. Are some things negotiable? That is for YOU to figure out before you tell them how it is going to be. Tell them straight up... you want 90% of everything you sell. Yes, they will look at you crazy (And this is where you have totally thrown this off course so now they are probably no longer on their A game) and then tell them to give you a counter. When they offer 8% now you look at them crazy and say I might as well watch Dr. Phil every day if I don't get atleast 28%. They say, the most we can do is 12%. Stick out your hand and say... if you can do 15% you have a deal. BUT...if they say no and you think 12% is too low, tell them thank you very much and have a great afternoon... and walk away. If you have to walk away make sure your posture is straight, don't slump. And have a happy face on. They could give in tomorrow or the next day but if they see you slump, they will think YOU will give in tomorrow or the next day. Remember, you don't need this money to eat.
^^^ This is how I make money each and every day. I don't play ball, I own the team. When you sit down to strike a deal with me you better be a fast thinker and good with numbers on the quick! By the way, in my mind, I would have probably wanted something like 10-12% in the scenery above as my minimum because I would already know what the going rate is. But I'm good at negotiations and usually can get more. But don't take less. YOU have 100% control of this situation, not them.