Today, all 44 individual state lotteries offer both Mega Millions and Powerball as a result of a 2009 agreement between the Mega Millions consortium and MUSL to cross-license their joint games to one another’s members, although the two organizations continue to administer Mega Millions and Powerball separately. D.C. and the U.S. Virgin Islands also offer both games. Only the Puerto Rico Lottery offers only Powerball and not Mega Millions.
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Despite the uneasiness of many to begin with, I know of no disputes or complaints from people who have bought Powerball tickets online via the insurance model, won and not been paid. As you can imagine, this scenario would effectively close down their website as they rely solely on the trust factor. The insurance model means that you will not be buying “official” tickets, but what do you care if you get paid your millions at the end of the day!
Powerball® tickets print the white ball numbers in numerical order of a given play. You can match the white ball numbers in any order of a given play to win a prize. The red Powerball number of a given play on your ticket must match the red Powerball drawn. Each play on a ticket is separately determined; players cannot crisscross play lines on a ticket or combine numbers from other tickets. 
Americans in the lowest fifth socioeconomic status group had the highest rate of lottery gambling (61%) and the highest mean level of days gambled in the past year (more than 26 days), the 2011 Journal of Gambling Studies research found. There were very few observed differences in lottery gambling for those in the three upper socioeconomic status groups — approximately 43% gambled on the lottery and the three upper groups averaged about 10 days of gambling on the lottery in the previous year of the study, a trend that was found in other countries with lotteries.
Rules vary according to the applicable laws and regulations in the jurisdiction where the ticket is sold, and the winner's residence (e.g. if a New Jerseyan wins on a ticket bought near their workplace in Manhattan). Mega Millions winnings are exempt from state income tax in California; while Florida, New Hampshire, South Dakota, Tennessee, Texas, Washington state, and Wyoming do not have an income tax. On the other hand, some residents of New York City and Yonkers, New York pay three levels of income tax, as these cities levy income taxes.
Reflecting common practice among American lotteries, the jackpot is advertised as a nominal value of annual installments. A cash value option (the usual choice), when chosen by a jackpot winner, pays the approximate present value of the installments. Mega Millions' previous format began on October 19, 2013; its first drawing was three days later. The current version of Mega Millions uses a 5/70 (for the white balls) plus 1/25 (for the "Mega Ball") double matrix to select its winning numbers.

State lotteries have become a significant source of revenue for states, raising $17.6 billion in profits for state budgets in the 2009 fiscal year (FY) with 11 states collecting more revenue from their state lottery than from their state corporate income tax during FY2009. Lottery policies within states can have conflicting goals. Given that instructions are passed down from state legislatures, lottery implementation is often expected to be carried out with reduced advertising and funding while still producing the same amount of revenue. This issue led states to look for loopholes in the system. Massachusetts, for example, had its advertising budget dramatically cut, and therefore started using free-play coupons as money to pay for advertising. This led to an IRS investigation into alleged non-reporting of income because the IRS considered the coupons to have monetary value.
The advertised Jackpot Prize is paid as an annuity of 30 payments over 29 years or, at the election of the winner, in a single lump sum payment of the cash value of the annuity prize (prize subject to State and Federal taxes). If the winner chooses the annuity, the annual payments will be increased each year by a percentage set out in the Lotto America Group Rules. Annuity payments are paid pursuant to Lotto America Group Rules and New Mexico State Law.
*a tip to know whether the website you are looking at actually buys lottery tickets online or follows the insurance model is to check the wording that they use. If you see the words “Play” then you can be confident it is a company that has agents and buys your tickets physically, if you see the words “Bet” you can be sure it is following the insurance model and you are placing a bet on the outcome of a lottery.