If you won even in small amounts on that six months then this should be normal. If youre aiming for the jackpot price then you should buy more than five tickets per day and if youre lucky, you can win the jackpot in a year, if not then dont blame the site whether it was manipulater or not. If the house always gives away jackpot then it will be bankrupt in a month.
You don't need to qoute the OP because his post was made on 2 years ago. I doubt he still asking about this until now.
Anyway, your suggestion to buy more than 5 tickets everyday is not helpful for him. If you see the pic from someone on above, you need at least 500k tickets to win the jackpot (it's not always true, but he never win with small amount of tickets)