One of the primary reasons why people stay addicted for long is to win big. They think a big win will solve financial and all other problems in their lives.
This is partly true. But gambling addiction appears in all people, both poor and rich, so the motive for getting big winnings for solving problems is not the main one. Addiction to online games is of a similar nature, but we are not talking about the fact that online game players are trying to upgrade their character and thus solve their life problems.