You would really be surprised and might end up get discouraged on reaching out that rollover or you will stress out on how you would gonna do that. Most of them do need 30-40x wager requirement for you to able to cashout thats why every promotion comes out into any sites i do usually check out their wager requirement.If it turns out to be achievable then i might consider to give a shot.
This is basically what keeps me away from casino bonuses as a whole- it's always going to have strings attached like an enormous wager requirement, and 99% of your time it's not even worth reading the fine print to figure things out. I prefer to stick with sites I know and trust and stay away from bonuses- they're made to be an easy and profitable way to lure people in anyhow.
Even if it's not a wager requirement, you can be assured the casino is going to do everything in their power to prevent you from getting any of your money out. Remember, you're not supposed to win here. The casino is.
In most cases its wager requirement and you are not able to play all games, mostly ones with jackpots. As a person who gamble a lot I tried this bonuses many times, its hard to be accurate how many times exactly, maybe more then 100 times, in all that less 20% I got to profit. I had so many wins and couple times I won more then 1 btc in single spin. I can make little tutorial how many nights I spent gambling like crazy, I deposit 200 dollars on 200% first bonus and I have 600 dollars. Believe it or not some bonuses I finished in less then 7 hours, if you are gambler you can imagine how agresive I played to pass requirements in that time.
There are to ways to make it until the end of requirements, first is slow, patience and control for playing with minimal bets and just occasionally rising bets. Second is aggressive play with pushing all the time, couple bad rolls next are more then tripled, if you are lucky to win something big fulfilling requirements can be an easy thing.
I still gamble with bonuses, not so much like before, but when site is new they offer low rollovers and I like to use that advantage.
In the end gambling should be fun, with bonus you get more money so you can try to risk it and with some aggressive gambling and luck you can win some big amount and have great gambling evening.