Because that isn’t the determining factor for whether you’re getting a good deal.
A bit of an oversimplification, but it doesn’t matter to you how the manufacturer and the bank account for their respective profits and losses.
For a stretch during covid, this was one of the few bright spots in leasing:
99% RV means almost all of the cost was rent charge. But the trucks were really cheap. It wouldn’t have made any difference if the RVs were lower and the MFs were almost zero if the lease cost was the same.
All that really matters is how much the lease will cost you in total, and there are other key variables (dealer discounts, incentives, not accepting any worthless add-ons, whether the MF is marked up, etc.).
Now… if you could deduct the rent charges from your taxes… okay, then there would be a reason to care.