Actually they do. The "Buy Cryptic Points"-page says:
"Use the form below to purchase more Cryptic Points / Atari Tokens.
Prices are not inclusive of VAT and/or other applicable local taxes."
But that requires people to actually read things, and we can't have that, now can we?
In all fairness, if the current administration has its way, it won't be long before we Americans start having to pay a VAT as well. And if you don't believe it, I suggest you research President Obama's cap and trade policies for a nice little eye-opener.