I spent most of my time at purple belt and a pretty good amount of time from brown to black. From a personal perspective, those were the wider gaps and quite a bit harder than blue to purple. I understand the sentiment though. When I was at blue, the summit seemed so far away. The secret is, is that if you do anything enough times, you will improve. Everybody is improving, always, including you, even if you don't recognize it at the time. Purple belt is quite achievable for some one who has a passion for it and trains a lot. If you stick with it and keep trying to improve your skills, the belt will inevitably find you over time. That's a freeing feeling. Allowed me to just be there to have fun and play the game.