I repeat, why do you block IPs? It is absolute ridiculous! By doing this, you can only minimize probability that U.S. player can register, NOT eliminate it. Even your filter has 99.999% accuracy, chance to register still remains. With power that have USA law enforcement agencies they can easily cheat your filter, register, deposit money and charge you THE SAME you have not implemented any blocking. Give me 2 BTC, for them I can buy high-privacy VPN account that provides unique static IP in most countries and is not in any blacklist.
It's called due diligence. We have a multi-stage process, and this is part of it.
Not blocking IPs would signal that we don't care, or that we aren't doing everything in our power to block American players. Look at it from our perspective. If someone lies about where they're coming from and has to use a VPN to access our service, they've violated our TOS in multiple ways and committed fraud. In the US, fraudulently gathered evidence is inadmissible.
In some countries the age of consent is 16. If a Federal agent uses a US address to order porn with 16 year old girls, and the foreign company delivers that pornography to the US, the company committed a crime under US law. If, however, they use an address in Germany and a fake name, fake ID, and lie about it; then have the porn delivered to a house and boxed up by somebody who takes it to DHL and ships it to the States, then who is committing the crime? Not the company that printed the magazine.
I think I've been pretty clear about our general philosophy on the matter...you're free to disagree and think it's stupid, of course, but we're a limited membership private club and we're doing things our own way. Are you in the US by the way? Are you blocked?