Sorry you found it confusing!
I suppose the point I was trying to make is that in SaaS you usually have a metric you price against (number of users, number of email addresses, monthly revenue, amount of $foo).
Secondly, many SaaS companies create "buckets" of those metrics for various plans - i.e. the silver plan has 5 seats, the gold plan has 10 seats, etc.
After a while, you might find that if you analyze your customer base, that your scale is miscalibrated to how your customers actually use your product.
Maybe your customer base ranges from 1,000 seats to 10,000 seats, or maybe your customers typically have between 1 and 10 seats.
Therefore, by adjusting your scale to your current customer base, you can effectively bring in more revenue without even raising the price for each plan.