Cooler has a point about us playing to his strengths. However, most teams play to the strengths of their attackers. The thing is, it not only the goals that Luis scores, but his constant running an harassing of defenders that brings us so much. I wouldn't mind selling Luis if we were guaranteed that his replacement would be a success, as a matter of fact getting to quality players instead of one, for that money really is a no brainer.
However, an it's a big however, there is no guarantee that his replacement would succeed. Suarez is proven in the PL. Imagine we get another morientes. Let's admit it, we all thought he was a fantastic buy, and he was a great player, but he just didn't suit the PL and LFC. I don't think we can afford that gamble right now.