it is rare that somebody is happy after gambling, ~~~
Absolutely, there are very handful individuals or gamblers that win and go happy after gambling. Most of these guys are cheaters of the system before they could have a win. Although, sometime i gamble and win and go happy but not a big win, but win is still win, so, people still win with varies amount.
You are right that there are handful of gamblers that win and are happy. But you are very wrong calling most of these winners as system abusers. It is rare to find hackers. If you noticed, there are only few issues (hackings and system abuse) to none on Crypto-Games, Primedice, Bitsler and other popular gambling sites.
I did gamble many times and since I started embracing crypto currencies I am sure I am positive overall. In 3 to 4 years of crypto gambling I think I am up by more or less $10,000 in estimate.
Even if I lost I am also still happy since I only gamble when I feel the crave to have fun with it. Because being a gambler is not a good reason to earn money.