Here's an interesting article from the National Fraud Info Center on:
Lottery Clubs -tips for avoiding Lottery Scams http://www.fraud.org/tips/telemarketing/lotteries.htm
excerpts:
Joining a lottery “club” won’t improve your chances of winning foreign lotteries. Con artists claim that pooling your money with other people means you can buy more tickets and have more chances to win. But the odds of winning remain tiny, and
you still don’t know if tickets will actually be bought or if you’ll ever be able to collect.
Giving your credit card or bank account numbers to strangers is dangerous. Crooks can use that information to make unauthorized charges or debits to your accounts, in some cases repeatedly. You may not find out until you get your next statement.
Your chances of recovering money from foreign crooks may be even worse than of actually winning a lottery. Most lottery scams are perpetrated by con artists in other countries, sometimes using U.S. addresses to disguise their real locations. Differences in legal systems, difficulties of conducting investigations in other countries, and expenses and other complications involved in pursuing cross-border fraud make the chances of getting your money back very, very slim.
The only guarantee is that you’ll end up on more “sucker lists.” When you respond to a lottery solicitation, you identify yourself as a potential victim, resulting in many more offers for lotteries and other fraudulent money making opportunities.
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So is this AZ offer a scam? I don't know ... you decide.