What's wrong with burgers? Expensive restaurants often have really good burgers.
That said, I'm a big fan of burgers and order them often. Screw what other people think.
This is hilariously wrong.
You might say that's completely obvious, but it helps some people to be reminded of it.
You also used the word "only".
Your sentence read as "you can't become rich other than just saving on expenses." Maybe you can see how that is a really weird thing to say.