I don't know what your numbers are, but if they're 3.0 and 164, you can get into an okay school. If you are really talented at law, do well in school and don't care about big law, you can be just as successful as somebody who gets a 180.
A lot of people on this website advise retaking because they are more practical than blindly confident, and want a certain level of starting salary to be the norm rather than the exception.
What are your numbers?
As per these threads, helping people get into law school, sometimes the advise to retake is something one would not do (assuming 90th percentile is great as it likely puts them ahead of their friends and the vast majority of people they meet who took the LSAT), and can greatly help them and their career. These forums are a self-selecting group so if you're the kind of person who plays better when you're with people better than you, they can be very helpful. If you like being better than those around you, they are very destructive.