In that case I'm guessing that you are personally responsible for a value-generating product and that you figure any extra profit the company keeps from this project that is above their average profit margin is money that should be going to you instead?

IOW, company had a net margin of 10%. Your project makes $1M/yr revenues and the company claims $200,000 revenue on that, a profit margin of 20%. You figure that they should reallocate half of that $200k to you so that you are paid commensurate with your contribution and they keep the remaining 10%?

That makes sense and I suppose the math is pretty easy in a smaller corporation or with a specialized product.