The only other way you use Chevron is by going to Mearas Hamachpeila or burying your dead there.
So maybe I am right – Avraham Avinu had to buy Mearas Hamachpeila in order to use Chevron – i.e. to bury his dead in Mearas Hamachpeila- but we don’t pay to use Chevron – by visiting Meoras Hamachpeila (which is what most people do in Chevron)