Of course, the real catch here was not the fish but Peter himself. The real miracle was not a quantity of fish so large that it resulted in broken nets but that Peter recognized his own brokenness. Somehow a net full of fish caused Peter to say to Jesus "Go away from me Lord for I am sinful man, O Lord!" Somewhere in the midst of hauling in that once in a lifetime catch, Peter moved from reluctant recipient to genuine disciple. Any other day, I have to imagine Peter's first thought would have been to rush this massive catch of fish to market or to whoever his regular buyer was so that he could profit from this enormous good fortune. But Luke says "When they had brought their boats to land, they left everything and followed Him". Peter left behind what must have been the largest, most profitable catch of his life as a fisherman, as well as all he had ever invested in, his nets and his boats, to follow Jesus.
We often have a tendency to think of life in terms of good or bad. We think that as long as we fill our lives with good things and avoid bad things then we are on the right track. But sometimes the biggest distractions in our lives aren't bad things but good things that we give too much importance. Peter's catch of fish was a good thing, a very good thing, probably the highlight of his career. But Peter could see enough to know that it wasn't the best thing in front of him. So Peter left everything and followed Jesus.