I don't find that a surprise. Budget entry-level springers outsell premium ones. Look at the air rifles handed in (pointlessly) during police "firearms amnesties". We all notice the occasional Mk1 Airsporter or whatever, but the vast majority are B2s, Gamos, Meteors, and their ilk. Often rusty or broken.
And check almost any gunshop. Lots of cheap springers in stock (and budget CO2 pistols, these days). And they sell.