Its hard for me to believe this. How many people have you seen committing suicide? 20?
For me, gambling addiction is a symptom of previous problems. Someone with a good life, with high self-esteem and without any psychological issues, doesnt get addicted to gambling or whatever. To solve your gambling addiction, you have to solve the previous problems first, and then, quit gambling forever.
Maybe there's a lot of them but its undocumented, they will be counted only as suicide due to personal problems or finances. Last June 2017 a known casino here in our country was attacked by a lone gun man. Burned the tables and took some chips, but unfortunately the law enforcers are quick to follow him and before the law enforcers cornered him, he burned himself to death. After a few days of investigation, it turned out that this guy owes a lot of money amounting to at least $150,000 USD.
There's ore of them out there, their stories are not sensationalized in the media or not picked up by the local broad sheet and maybe the family would rather not disclose the exact reason why one of their family member committed suicide and just declare due to depression.