In general I would say that I spend much more time and money at casinos than betting on sports. Only in the last few months I was more active with sports betting due to the World Cup and the last CSGO major. Whenever there are big sport tournaments I get hyped and want to bet on them. And now with no big tournament around the corner I will stick to casino games. Placing 6 BTC on a single bet is a lot of money for me at least. You must have a big bankroll for such kind of bets and coukd hopefully afford if the bet turns bad. Picking the right bookmaker is important for these kind of bets. How about you split up your bet and place 1 BTC each at 4-5 different websites? There are many trusted websites promoting their business here on the forum. I would go with companies that have been around for several month already.