Go ahead and dream big. I think it’s worth it.
Not for any trite, success-based reasons. It won’t pull success to you. It’s fun to dream big. It’s its own reward. It’s a good experience, here and now. It’s why people buy lottery tickets. Save your money because you can get the same effect for free.
Don’t forget to also do something, though. If anything will pull success to you, it’s that.