Low volume is a constant across their existing offering and this "made in usa" offering, which if you've been following the librem 5 story at all you'd already know is unnecessarily overpriced.

There's no need for them to limit demand of the USA model with a higher price, the demand for this phone is very low in general considering it's not even usable as a phone.

Edit:

"Librems are heavily overpriced but that is because Purism seemingly never tried to get better deal and the South San Francisco partner abused this so that is why Purism Librems are double the price they should be." - Zlatan Todoric former Purism CTO [0]

[0] https://www.phoronix.com/scan.php?page=news_item&px=Zlatan-T...