I usually play in tournaments for about a $0-$20 entry fee yes I have gotten to play in some free tournaments. In these tournaments they have weird rules. One time I played in a tournament that restricted doubling to 10-11 only and I was wondering how that effects tournaments. Plus I think the players will bet a lot more aggresively on a free roll than in a buy in tournament especially when there is only 1 place to move on.
