Money was easy to earn if you had the right skills; this was a fact. If Dalvin's power system was based on sci-fi tech, he could just hack the system and download money into his account, but since he was stuck with physical power enhancement, he had to use avenues pertaining to that.
That was why things like stock market trading and whatnot were not useful to him because even with simulation, there was little he could do with one hour since those markets were controlled by the big boys.
Rather a casino could be his playground because with his senses, he could play most of the games there and cash out heavy amounts. However, everyone knew that casinos were incredibly thin-skinned, willing to swallow your money but unwilling to let you swallow theirs.
Dalvin would have to be smart with how much he claimed from them and how. After all, the first thing casinos used to stop your rampant behaviors were accusations of cheating, so Dalvin had to prepare against that.