That's a very narrow window of value. If < $10k means you're better off going with the per-transaction rate, >10k but less than $13,095 means you're better off with a regular merchant account and > $13,095 but less than $21k means you're better off with the flat rate, then how many firms would really benefit from this?
Looks like they should say "if you're doing more than $10k (or $13k if you want to bring in the competition), but less than $21k, take this deal". But of course, no one would take it.
Square has value beyond their rate. They also have an interesting/evolving point-of-sale iPad app, and a groundbreaking wallet app. These could help grow business beyond the shavings of a percent that you'd save playing the processor numbers.
And there's value in a simple rate, too. Yes maybe you could run the numbers and find some scenarios where you'd save elsewhere, but it's a very confusing and somewhat deceptive landscape, and if you get it wrong you might actually end up paying more. There's value in knowing that you're going to get a pretty fair and understandable rate up to at least $250K/yr of revenue.
Looks like they should say "if you're doing more than $10k (or $13k if you want to bring in the competition), but less than $21k, take this deal". But of course, no one would take it.