I suppose we each like knives various reasons.
Leaving out the so-called 'mall ninja, I-bought-a-knife-so-I'm-tough/spec-ops/tacticool' wannabe types...
For outdoorsmen and women, its an essential tool to help with 'escaping' to the outdoors to enjoy nature -away from the challenges and frustrations of the daily 'grind'. For some, time spent using a knife in the woods and around camp with friends and family is as good as it gets.
For others, knives are essential tools for the job or way of life. They need to cut things, and knife is what they use. Its a tool, and as a professional, they select the tool that fits their needs. Some will find the $5 cheapo to their needs. But others, usually knowledgeable with knifes, will want the much higher quality unit for its performance and how it assists with their given profession. They might be a first responder, butcher, serviceman, or many other professions.
For some, its about personal safety.
Others are collectors and enthusiasts, they purchase for pride of ownership, to enhance their collection, and/or use.
I'm sure theres more reasons...
Just my $.02 worth...
BOSS