The commercial development license is one facet, but the royalty per-unit payments are not mentioned. The product I currently ship with Qt is somewhere around USD $1 a unit.
Is this some sort of licensing model that they don't advertise? The only commercial licenses I'm aware of are per-developer licenses with no royalty structure.
"For regular desktop applications, there are no royalties, runtime licenses, or other additional costs. For fixed systems or devices where the main functionality relies on Qt, a runtime distribution license may apply."