This.To answer my own question, it would be fun for the first year or so. After receiving everything you want when you want it, for so long, the satisfaction would without a doubt dissipate. But then again, you'd have so much more money to do and buy so many other things, one would forget about knives for a while. The Emperor's villa at Caesar's in Las Vegas tends to make people forget things.
I doubt something as mundane as knife collecting would be that much interest to a person of unlimited wealth. Sports cars, airplanes, rare medieval armor, long-legged blondes, etc would be much more fun to collect.