Has anyone had to deal with Support 'fairness' with multi-edition customers?

As a SaaS company we have several 'editions' of product that customers
may purchase.  Our support offerings are decoupled from the editions
and so we may find that 'higher paying' customers (based on edition)
who have not chose to purchase additional support are covered by the
level of support as entry-level customers who 'pay less' (based on
edition).  How have other companies dealt with such inequities?

Looking forward to your feedback!