I agree with most of what you have said, and your method makes a lot more sense than most breeding loans I have heard of. I have thought about this a lot myself. (By the way, I have 2 adult male albinos and 14 50% het females, so even though I am an atheist, I practice what I preach!
But you are just looking at what the owner of the normal female is getting with a jealous eye and not considering what you are getting and what it costs you.
No, not at all. The way I see, it is your jealous eye that tempts you into the breeding loan even though the outcome will short change you and reward the other person. It is your greed that makes you willing to do this, because you see the outcome of this breeding as a bonus for you, instead of a business deal. But in reality (assuming you have the high-end morph) you would come out way ahead if you treated this more like a business deal and purchased the breeder female outright, and then kept all the babies from that breeding. It's not a question of greed to me, but more a question of ethics and what I beleive is fair and what isn't.
For instance, lets say you have male pastel that is worth $2K and a normal female worth $500. For $2,500 invested, you have a chance at getting one clutch, but by purchasing another female for just $500, your investment is only 20% more costly to you, but your possible outcome is increased by 100%!
Now let's look at it from the other person's perspective. The other person with the female would have to go from a $500 investment, to a $2500 investment by purchasing the pastel male, in order to have any chance at producing any morphs--so they have to increase their investment by a whopping 400%.
So you would have to increase your investment by 20%, or they would have to increase their investment by 400% to get the same outcome--hardly fair.
Most breeding loans are a scam in my opinion (whether it is intentional or not) Amateur breeders tend to look at it this way: I contributed one animal, you contributed one animal, so we should split the babies evenly. But in reality, it is more like I contributed $2000, you contributed $500, so we should split the babies in a ratio of 4 to 1. But this rarely happens in breeding loans.
I think this is far more practical than your method of how much of the season is used up per animal because the price of the animals (the market) already accounts for this. For instance, if there weren't any high end morphs out there, there is no way that normal females would be selling for $500 each. Their price is based on the market (not the remaining breeding season of the animals) so the market price should determine how the offspring are split.
Rodney