Do you really think that those people were giving that advice for selfish reasons? I'm guessing that they had good intentions, and honestly believed what they were saying.
> I'm guessing that they had good intentions
Everyone has good intentions.
> honestly believed what they were saying.
So what?
> Do you really think that those people were giving that advice for selfish reasons?
In many cases, yes. Sure, they also honestly thought that things would work for you, but that's the nature of "win-win".
At best, that means that you have a beef with folks who told you that. However, you might want to think about why you believed them. Also, consider that they were trying to get you to buy into something for their benefit.