Before anything else, I search for reviews regarding the said crypto casino. I would also check if ever some of my friends has already played in that certain site. After gathering information, I would bravely try it even if I know that it is quite risky especially if you are a first time crypto casino player. I am now playing in this site and lemme share you my early days in this bitcoin casino. I was so nervous before playing in this site good things they have a free play and it's enough for me to buy time for the meantime in order to decide whether to go on with this site or not. After deciding to go further, I have deposited amount on my account and they gave me ample amount of bonus on my first deposit as well as on my second deposit. These bonuses gave me more than enough to have the upper hand in each game I am playing. In addition, they are using bitcoin as their only currency and no other. And now I'm earning more than enough bitcoin to my liking. They also have a good customer service and is approachable that's why I have put majority of my trust in this site.
You don't really expect complete fairness in any casinos. There will always be an advantage in favor of the house just as you've mentioned. And i think gamblers, long time gamblers that is, are well aware of that and can develop certain formulas to cope with those house edges. Though 1 or 2% edge can be considered fair though since they need to have something to continue running the site. Just be wary of those that are sketchy and has high negative reviews.