I've not found much advantage to locking blades in actual use. I do appreciate one hand openability. And perhaps oddly, I kind of like the ease of closing that comes with non locking blades. As a result, traditionals are something I don't shy away from. And I've been quite pleased with the modern one hand opening non lock blades that have popped up in the last ten or so years. Many of which offer one hand opening. It's not unusual for me to carry a GEC or Case, SAK, and/or friction folder, no locks in sight. And I have no actual dislike for locks either. I still carry them sometimes. It's just that I think non locking knives offer advantages that some folks never consider.
Regarding cost, it seems to me that nice US made traditional can be had quite reasonably, especially considering the labor intensive procedures involved in their production.