Why, thank you for asking!
I like to think of it as the Schrödinger's cat pricing model - free, and not free at the same time. You get to decide how much you can and are willing to pay.
If you're a rich currency trader looking for a sneaky tax deduction, maybe $2000 is a fair price; a producer or composer with a budget, $20-$100. If you're a music student struggling to pay the rent, enjoy the free sample library and buy some groceries instead.
In a nutshell, Clockwork Monkey sample libraries are not free, they have accessible pricing.