17500 * $30 = around $500,000

$350,000 at the lower end where he said $20.

I don't think the expendable upper stage on its own is $350,000-$500,000. I think the fairing is probably more than that.

Try again? The comment you’re replying to says “$2-3k” per kg. That’s $2000-$3000 per kg. If you multiply your numbers by 100, you get something comparable to the prices on SpaceX’s website.