2 cents profit per day on a USB asic for 299 euros as an example of the worst investment in mining.
Why are these USB ASICs so expensive?
Somebody was selling the first batch for 800 on eBay back when it was launched, it's not a price that is set in stone.
Bitcoinmerch is selling it for $199 that's 50% cheaper and it's selling a 6x pack with hub and fans for $999, that's $166 a piece.
It's a 2021 design made in small batches that is now treated as a cool piece of history, that's why prices are so high.
Why are prices so high? I don't know, but it's easy to think that those who produce these USB miners don't benefit from the same rates as those who produce tens of thousands of ASICs for their components? Economy of scale is something to consider IMO
The s9, (although if I remember correctly the Compac F uses S17 chips) had 189 chips, the rest of the miner is cheap compared to chip prices nowadays so there goes the additional cost distribution for the manufacturer while with the USB is a ton of work on small batches, then there is the thing that Bitmain doesn't sell the chips directly at their production cost so far costlier. You can't build something with more work, and more customization while buying all the components from the guy who mass-produces and charges you extra for them
and then compete with him.