"Prior to the most recent update, some Knives, like a Doppler Ruby Butterfly Knife, could fetch around $20,000 on third-party storefronts like CSFloat."

They're mentioned right there in the article this is nominally meant to be a discussion thread about.

But the argument was "they're running an online casino directed at children", the fact that someone buys the result of the gambling for adult money / $20k doesn't mean it's not, and is basically irrelevant to that statement.