Do the regular groups only buy tickets for the Lotto 649 lottery?
Yes, for the vast majority of ticket purchases. If there is an opportunity though, to buy tickets for a lottery with an unusually high expected value, the organizer has the option to buy tickets for that particular lottery. In all cases though, the portion of the jackpot that each share could win must meet the minimum value set for the particular regular group. For example, Group B1 could buy tickets for another lottery as long as the jackpot for that lottery is at least X millions of dollars where X is the number of shares in Group B2.