I read a sentence about the leasing business: An underappreciated twist of the leasing business id that the contract actually gets more profitable as time goes on because of the way the lessor amortizes its interest expense. Leases work like mortgages, so interest expense declines over time.
Question: why does the contract get more profitable when the lessor gets less? Profitable for the lessor?

Less expense, But the lessor still gets the same income.