It's damn near impossible to hide the algorithms completely. There's always going to be someone who reverse engineers them if they are motivated to do so. Even if you only get to within a few percent that would be sufficient. Not that I seriously care about pricing unless it affects my personal purchases; which are small enough to shop around and still generally cheaper here in most cases. I feel bad for people with large product offerings that have published catalogs with prices and need to be competitive in their niche areas. Having their production prices zig-zag up and down multiple times during a year would be a real bummer.