First of all, the rod could have been damaged before it ever left the store. Have you ever watched some people handle rods at BPS or any tackle shop, pretty scary........ I go over a rod with a fine toothed comb before taking it to the checkout. I was in a sporting goods store yesterday, and a St. Croix Avid had a split 5" long just above the grip. I showed it to the owner so no one would walk out the door with it.
I have a St. Croix Legend Series that is 15-18 years old, and been through it all, and is as wonderful as day one. Don't give up on St. Croix.
So, my guess is, the rod was damaged when you bought it, you somehow damaged it without even knowing or the line was wrapped around the tip when you popped the lure free and snapped the tip. This would have happened with any graphite rod. If necessary, cut the line and your losses next time.