edit: Denmark VAT is actually 25% not 20% so the USD price plus Denmark VAT is ~$750
So the higher price in Denmark looks like VAT + some extra costs for being in the EU market; import duties, corporate taxes, etc.
With state sales tax of 8% where I live, the base would cost me $648.
So not a huge difference.
Denmark has a VAT of 25%, so the DKK 5499 price without VAT is DKK 4399, which amounts to ~$684. Still more but not substantially.