I never played btc lotteries. I saw a few, don't know if they are trust worthy or not, but the problem with them in my opinion, is that they don't offer big prizes, compared do fiat lotteries (like Euromillions) because they don't have much players investing in them.
And since in my opinion the only appeal in lotteries is to think that if you get first prize you will be millionaire, there is no point in playing in btc lotteries for now.
Also not saying I like lotteries, I tried them but the odds are just to bad, so the few times I did it, was with the minimum amount possible, to see if the miracle would happen, but doing it in a sustained manner to try to get the prize is just financial suicide lol.
Actually the prize is depends on how many people participating in it, more people participate in it the higher amount of prize to win but still it depends on your balance too to win it. Higher balance means higher chances to win and it depends on your luck too, sometimes with higher balance you can also lose but the chance is little. Either you can be millionaire or not depends on the participant that join the lottery
6 digits is worse. Only got the lower prices sometimes. 
