In that instance, it's a "Free" item and the option there to "pay what you want" refers to if you want to pay some money for the free product. Like a "tip". Selecting other products reveals a set price but this has zero dollars set as the minimum with no maximum price limit.
tks for your lights buddies ! always good to have some open views on what "free" could hide/mean ! 😉
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i didn't click the link myself (since i have some other tools for that) but the idea to have this trick directly in daz could interest some people...its always a real pain to (re)adjust the neck/torso whenever u -totally- change the head without touching the body (or vice & versa) ! just have to morph !