Yes most are likely addicts, but the addicts run out of money- usually fairly quickly. The shooter managed to do this for years- so he was either being paid well by someone to do something or he was laundering money for someone.
The old saying “follow the money” really leaps out here. The real estate transactions that have been reported do not explain the money he had to have, some of them he lost money on. I do not believe it is possible to make money playing video poker over a period of years. If so, the casinos would have decided he had a way of rigging the game or something.
Someone posted on another thread that maybe his dad the bank robber left him some money under a rock in the desert. Maybe, without all the technology of today people did get away with robbing banks. I did read that his dad was suspected of robbing like 16 banks and only tried/convicted of 2 bank robberies.
His money came from something, I am not convinced it was real estate or gambling. It is possible to make big money with real estate but one article showed his deals and it didn’t seem like enough to make it all work.
The reports are that he owned at least 2 apartment buildings, and perhaps more. That could easily result in a sizable amount of monthly income. If he was truly a millionaire and as good with numbers as we are being told, it is possible that he was simply taking in more money from his investments than he was losing at his gambling.