This reminds me of a (dirt cheap - about 0.5€) scratch ticket available when I was growing up. The number of winning tickets, as specified on the ticket, was 51%. The 2% up from the usual 49% meant you won more than you lost. The smallest prize was about twice the cost of the ticket. We would run to the store on our lunch break, buy a couple of tickets, rinse and repeat a few times, and have money for whatever food we wanted for the day.
(and no, you wouldn't be able to farm them - the store only carried X amount of tickets, and they usually sold out quickly)
Fun fact, at that time the gambling industry was regulated in Sweden, and as such all games (and otherwise - e.g. scratch tickets) was all sold by the government monopoly.
As to the reason why they would have a loss leader in an organisation that actively worked to minimize gambling - beats me.
The scratch ticket was later renamed, and with the rename they reduced the number of winning tickets. It was at 48.5% (or thereabouts) last I checked.
The monopoly has now been abolished, largely due to pressure from digital services.
(and no, you wouldn't be able to farm them - the store only carried X amount of tickets, and they usually sold out quickly)