Well, if you don't like what he's doing then you can always create competition? How about offering exactly what the OP offered and lower it by say 5mil or just ask for 50mil and the customer can come in naked on any job.
It's a free market. If you want to be a smart customer, you better start lining up your sellers and see if you can pressure them into a better deal.
I think comeatmebro in leviathan is offering something similar but customer can come as a naked Cor only to do rolls. I have also seen JP shout for doing 1-5 NM, which should net you a good amount of plasm. One can easily leverage this as you can say that you don't really need the plasm so 50mil for KI would be too much. Then offer to give back some airlixirs+2