Konstantine noted how a cheap $40 balisong can be compared with an expensive $200 balisong by using Loctite. Loctite protects the screws from falling out and, because of that, protects the knife. This will prevent the knife from falling apart during use. This also preserves the knife quality.
In the article, the benefits of a $200 Benchmade knife is noted. For $5, you can get the edge sharpened back to a factory finish. Benchmade will also mail you replacement screws if you need it. You can learn more about the best balisong knives here http://bestmachete.net/