How many raffle tickets i will get for every 1 BTC wagered amount, i can see on betterbets option to purchase raffle ticket.
1 BTC would give you 5000 raffle tickets, they are 20k satoshi apiece if you purchase them directly versus betting to earn them. To earn one through betting costs 50k satoshi worth of bets (100 satoshi *500 bets placed =50k satoshi) So essentially buying them directly is cheaper but betting for them you have a chance to win or lose BTC as well.
Use this as a guide for betting to earn:
1) Bets > 1 BTC count as 2500 rolls towards a raffle ticket (ie: 5 raffle tickets per 1 BTC roll)
2) Bets > 0.1 BTC count as 250 rolls towards a raffle ticket (1/2 raffle ticket)
3) Bets > 0.001 BTC count as 25 rolls towards a raffle ticket (1/20th raffle ticket)
4) Bets > 0.0001 BTC count as 10 rolls towards a raffle ticket (1/50th raffle ticket)
5) Bets > 0.000001 BTC count as 1 roll towards a raffle ticket (1/500th raffle ticket)
6) Bets < 0.000001 BTC do not count towards a raffle ticket