Yes this is quite cheap for the current price, but actually 50 ticket wont really be enough on what you can get from faucet, and why you buy it when you can really earn it from faucet and it is free. Someone claimed that they can get 180 in a week so this will more than enough not to buy the tickets. But it depends on yourselves too whether you are going to get something or not at all
You have 2 free tickets each free roll. With an average of 13 free rolls a day, I have 26 tickets each day, 182 a week. It's a matter of luck anyway, with a single free roll (2 tickets) you can have a price at the lottery.