People often tend to think that they aren't lucky in some casinos or games and just blame that for their loss and consider it responsible for their lost money , so they try to change casinos from time to time thinking that they will get lucky in it .
We can see that you are not so big gambler. People like me like new casinos because new casinos offer great promotions to attract players. They offer bonuses, promotions, different prizes, they offer some kind of loyalty points to keep you there and leave casino where you gamble currently. Its all in that, how else can they attract players, and who see it first and have some money can win something great while competition is not so strong. Big sites have so many players and many prizes are for high rollers, in new site with a bit of luck and some little money you can take that prizes and win something more, I had big luck with new casinos so its possible.
I agree to this reason which this is one of the things why people keep on trying to play on new sites because of the promos that it gives and the competition have been started and had being said competition would really be less which means chances on hitting that top leaderboard would be somehow easy compared if you do try it on old reputable gambling sites which we do saw there are lots of big players.