Quality is supreme. Now about the weight over the worth; you should build your tools from a core set that gives you the tools most often used. Yes the guy with tons of tools may have a tool you don't but, even the guys with massive tool chests have a need for something different every once in a while.
I don't have a massive number of tools; yet I have not found too many things that kept me from doing what ever needed to be done. I don't have short, medium, long, flex, impact, 6point, 12point, 8 point, hex, torx, triple square, etc, etc. I do have wrenches and sockets, screw drivers and pliers, hammers and punches, pullers and special tools as needed.
A good case in point is metric taps and dies, I have individual sets of taps and dies in the sizes I use. I don't have a kit of things that resemble taps and dies in an attractive blow molded case. All my taps are HSS ground thread in sets of taper, plug and bottoming, all my dies are HSS adjustable dies. Do I have more in them than the plastic cased kit, yes but not that much more and I have taps that are useful for blind holes and dies I can tweak for fit.
I have good quality tools because I would rather buy a tool once and know that it will perform when needed. I can understand the guy that buys the *** piece set from Sears or Harbor Fright because they don't really know what tools they need and use their tools once in a while.
For me personally I know well ahead of time if I will need to buy a tool or tools to do a job(most of the time) if I have some catastrophe and need a tool right now I will go to the orange palace of smelly rubber. I also buy stuff that I am rather sure will be one shot use tools like a 12.00 spray gun.
That is not to say I don't like a bargain or want to get the best bang for the buck. I just means I will spend some time qualifying the best products at the best prices. The hunt is half the fun, you can ALWAYS buy retail, searching for something and finding it way below list is very rewarding both financially and psychologically.
Steve