You could make some unique games with new features, as you can see with their opinion lottery is a bit old school and i don't think people would be attracted with it too much and I'm one of them. The probability of winning is very low, that is my reason. Maybe it could worked out if you would out add some new features with it. Don't worry i would love to try it out if what will be the outcome of your plans.
What do you think if lottery tickets will be with numbers, and after buying you will see your number?
And if lottery ticket cost is 0.01 BTC and the prize is 10 BTC, every ticket with number 1000 is a winning one?
After prize is paid tickets numbers starting from 1.
If you bought ticket and it's number is 980, there is a good chance to take next number: 1000
But if you get number 115, you should wait some time