A lot of threads in gambling section are basically dedicated to scam accusations. They can be seen every day on the first page. The casinos about which people complain are usually new or known to be scamming people (one can easily check out the trust of members leading the respective ann threads to be assured in that). I don't understand why people deposit money onto new casinos and then complain that they scammed these people. I mean, there are lots of very trusted casinos offering a wide range of games, so why not to keep playing at them rather than some unknown risky ones?
The most common reason is that because new casino offer more bonus as compared to well established casinos and hence people are more keen to try those websites. Another reason for gambling on new website is that because people want to try out new games and each website have something unique about itself.
Some people feel lucky when they make new accounts on new websites rather than betting on a single website multiple times.
I cannot say much on this because I have been myself in such situation when I was new to dice gambling and I remember primedice was very new then, I used to make new accounts and gamble and actually it works too sometimes.