willget800,
I also doubt whether
ALL the questions on GMAT will be of this level of difficulty. Having said that some of these questions have helped me in understanding the concepts better and improving my thought process (or atleast I believe so

)
I always used to fear the inequality and modulus type of questions, but after practicing for >1 month, I still can't solve some of them, but I don't fear them anymore.
So In my opinion the questions on the forum should be used as learning tools rather than measuring sticks of ones so called "level" (I hate that word!) of math.
Let me give you an example. I am working on the SC1000 and I have a hit rate between 60%-80%. Some days I do really worse 58%

. Does that mean I am an idiot? Probably not. I just take it positively and try to learn the concept that is needed to answer such questions.
Moreover, you are doing great and I have definitely benifited from your answers. So why have such doubts? Keep the same attitude as your login name and I am sure you will do well.
HTH.