I think the reality is that all these 'gangster rappers' dry snitch on themselves at some point. At the end of the day, it's all for entertainment purposes.
Also, none of em are as rich as they rap about. Some might've touched a couple mill in their lifetimes but shit, we're talking about hood folk here. For the most part, I'm sure most of them have either shitty spending habits or terrible investment strategies. All depends on each person's definition of 'rich' though.