I was always told to spend the same if not more on your glass as you did on your rifle.
Of course this has to be taken into perspective..
I started out with a vx-1 and it was a great scope for many years. However I found the need to upgrade and now I have a much better scope and I wish I had bought it from the beginning.
However I will agree that if you can see an animal clear and true at a distance you are comfortable shooting at than your good to go.