Anybody that deals with construction, whether it's large-scale projects or small-scale woodworking, knows that most construction generates some amount of wasted material, or scraps. In construction, the cut-offs and scrap material get thrown in a dumpster by a laborer, and nobody thinks twice about it. In woodworking, especially a small shop, those scraps add up fast, take up space in the shop, were paid for by the woodworker, and if they're to be thrown away, it's usually the shop owner or one of the shop employees that has to spend the time and effort to do so.
In short, it's very financially beneficial - especially for a small woodworking shop - to figure out a way to use those scraps from a big project to create something smaller. Cutting boards are a popular answer to the "what should I do with all these hardwood scrap leftovers" question. And, given the limitless possibilities in terms of design, they're halfway fun to build (but only halfway...unless you really enjoy sanding end grain, then these things are right up your alley).
I recently generated a bunch of scraps from a large piece of cherry being used on another project, and I always hate to throw away any hardwood scrap, so this cutting board is what those scraps became.