Interesting story.
I have personally never had any of those dreams, about gambling or a person coming to my dreams and offering me a victory. Though, it is a very recurrent theme here in my country (specially in the east), people do not only play lottery numbers or animals based on the things being said to them by dead people in their dreams. They play lottery or bingo based on any number or animal they see in their dreams, regardless it is a direct instruction given to them or not.
Yes giving games in the dream does not necessarily mean they must give you the game and tell you the matches to play but always come with parable. Like me any message given to me in my dream I always convert it to code. And it usually works for me. Sometimes it might come as a message with date and time. Sometimes you will see numbers or given a date or time on when to do something. And indirectly is a gaming Lotto code. For those who understand the type of gambling am talking about.
To be honest with you, if something like that happened to me, I decided to play and indeed I managed to win some money because of something I saw in my dreams, while being completely unconscious, that would completely blow my mind and change the way I see life and the supernatural phenomena. Because, even though those dreams are alledgely common here in my country (to the point of them being part of the popular culture) I have never had one of them myself, most of my dreams are much non-sense and psychodelics.
How did you feel the first time that kind of thing happened to you, by the way? Did you feel scared, reluctant to play or did you feel blessed from having such information in your hand?
I believe before playing, I would try to find some religious counseling, with my family.
Funnily enough, in the end I think they would encourage me to play and give a little bit of money to them.