@164Morhf, you impose your own view. Regardless of whether you define 3, 4, or some other number of tiers, your idea has two flaws.
First, it assumes other users would want a tiered system rather than individually negotiated pricing. That is a huge and unsupportable assumption.
Second, you mistakenly believe it reduces the number of pricing entries. It does not, because you still need to record and maintain choices for all customers and all inventory and non-inventory items. You cannot presume that a customer would enjoy the same price tier for all items.
You may think you are the first to suggest this. You are not. It has been discussed dozens of times in the forum. There is a reason it is not on the ideas list. No one has suggested a broadly workable concept.