There is NOTHING wrong with breeding a pied to a pied and getting a bunch of pieds. Sure sometimes the fun is in not knowing what you'll get, but you're for sure not going to hatch out a 5 egg clutch of only normals.
Piebald BPs are in huge demand and will always be crowd pleasers. If you're concerned about it from a financial perspective, think about how much you'll have to spend to get something BETTER than a visual recessive piebald to pair with either of your snakes.